Mediterranean diet during pregnancy and infant neurodevelopment: A prospective birth cohort study
Fei-cai Dai1,2,3,4† Peng Wang1,2,3,4† Qiong Li1,2,3,4 Lei Zhang1,2,3,4 Li-jun Yu1,2,3,4 Lin Wu1,2,3,4 Rui-xue Tao5* 
Peng Zhu1,2,3,4*- 1Department of Maternal, Child and Adolescent Health, School of Public Health, Anhui Medical University, Hefei, China
- 2MOE Key Laboratory of Population Health Across Life Cycle, Hefei, China
- 3NHC Key Laboratory of Study on Abnormal Gametes and Reproductive Tract, Anhui Medical University, Hefei, China
- 4Anhui Provincial Key Laboratory of Population Health and Aristogenics, Anhui Medical University, Hefei, China
- 5Department of Gynecology and Obstetrics, Hefei First People's Hospital, Hefei, China
Background: Embryonic neural development is associated with intrauterine nutritional status. However, few cohort studies estimated the relationship between maternal dietary patterns during pregnancy and offspring's early neurodevelopment.
Objective: To examine the impact of the Mediterranean diet (MD) during pregnancy on infant neurodevelopment, including the potential mediating role of cord blood metabolites.
Methods: Among 1,471 mother–child pairs in a prospective birth cohort study in Hefei, China, we investigated the associations between maternal MD score [calculated based on a validated food frequency questionnaire (FFQ)] and child neurodevelopment at infancy [assessed using Ages and Stages Questionnaires, Third Edition (ASQ-3)]. The cord blood metabolic markers (including C-peptide, high-density lipoprotein-cholesterol, low-density lipoprotein-cholesterol, total cholesterol, and triglycerides) were measured.
Results: The MD score was negatively associated with communication domain developmental delays in infants [relative risk (RR) with 95% CI: 0.34 (0.16, 0.72)]. Compared with girls, boys born from mothers with lower MD scores during pregnancy were inclined to the failure of the communication domain [RRs with 95% CI for boys: 0.34 (0.14, 0.84); for girls: 0.26 (0.06, 1.18)]. Mediation analysis showed that the association between the maternal MD score and failure of communication domain mediated by C-peptide was 19.4% in boys but not in girls.
Conclusion: Adhering to the MD during pregnancy was associated with a decreased risk of poor neurodevelopment, possibly mediated by lower levels of cord blood C-peptide.
Introduction
Neurological diseases have an enormous economic and emotional impact on families and society (1, 2), and identifying modifiable factors from the early stages of life could alleviate the burden (3). Environmental factors, in particular nutritional factors, in early life are considered to be vital factors of neurodevelopment (4, 5).
Most previous studies on the relationship between maternal nutrition and child development focused on individual foods or nutrients rather than dietary patterns (6). The Mediterranean diet (MD) accentuates the intake of vegetables, legumes, fruits and nuts, unrefined cereals, fish, olive oil, moderate dairy products, and low meat (7). Epidemiological studies confirmed that MD was beneficial to multiple offspring health problems (e.g., preterm delivery, fetal birth weight, early growth, and cardiometabolic risk) (8, 9). Beneficial foods in the Mediterranean diet, such as fruits and vegetable consumption during pregnancy, have been shown to support neurodevelopment in offspring (10). A randomized controlled trial (RCT) study investigated that nuts and olive oil consumption were associated with better nervous system function in humans (11). However, the available evidence on MD during pregnancy and infant neurodevelopment is still limited.
Adhering to MD during pregnancy may reduce the maternity risk of metabolic disorders (12, 13). Data have demonstrated that maternal metabolism can change neonatal metabolism (14). Metabolic markers measured in neonatal cord blood provide insights into the placental transfer of maternal nutrients (15). Moreover, evidence shows that there exists a link between metabolic markers in early life and offspring neurodevelopment (16). Thus, the relationship between MD during pregnancy and infants' neurodevelopment could be mediated by the maternal–fetal metabolism.
Gender difference in neurodevelopment has been reported, and compared with boys, the nervous system in girls adapts better to nutritional stress conditions (16–18). A previous study demonstrated the significant associations between maternal glycemia and poorer neurodevelopment in boys but not girls (19). Evidence on the gender-specific impact on the relationship between maternal MD during pregnancy and infants' neurodevelopment was not determined.
This study aimed to investigate the independent association of maternal MD and infant neurodevelopment in a prospective birth cohort adjusting for potential confounders. It could conceivably be hypothesized that (1) maternal MD is associated with a reduced risk of poor neurodevelopment in infants and (2) cord blood metabolic markers may mediate this association.
Methods
Study population
This study was a population-based birth cohort that recruited pregnant women from three centers in Hefei (Anhui Women and Child Health Care Hospital, the First People's Hospital of Hefei City, and the First Affiliated Hospital of Anhui Medical University) (20). Pregnant women aged 18 to 45 years, living in Hefei, with no communication barriers, and who had delivered a singleton live birth but without assisted reproductive technology were recruited. From March 2018 to January 2021, a total of 3,566 participants' baseline data have been finished. This information was completed by structured questionnaire through a face-to-face interview when the participants were 16–23 weeks pregnant. Participants' essential characteristics including sociodemographic characteristics, perinatal health status, and lifestyle during pregnancy were collected using questionnaires. Venous cord blood samples were collected for the detection of cord metabolic markers at delivery, and the delivery information was copied from the medical system. The childhood follow-up was conducted by community physicians at 6 months and 12 months of age, which was also completed by the questionnaire. This study was approved by the Ethics Committee of Anhui Medical University (number: 20180092). All pregnant women ascertained their willingness to provide written informed consent for themselves.
During the pregnancy follow-up period, 297 participants were excluded due to being diagnosed with liver, renal, and thyroid dysfunctions or diabetes before pregnancy, being diagnosed with liver or renal dysfunction during pregnancy, or not having complete dietary data. A total of 342 participants were excluded because of gestational age of < 32 weeks, delivery in other hospitals, or failure to provide cord blood samples. During the postpartum follow-up period, 859 participants were excluded due to birth defects (n = 97), unable to complete the Ages and Stages Questionnaires, Third Edition (ASQ-3) (n = 373), and lost to follow-up at 12 months (n = 389). Finally, 1,471 mother–infant pairs were analyzed (Supplementary Figure 1).
MD scoring assessment
Food consumption frequency and serving size in the past month were collected at 16–23 gestational weeks using the food frequency questionnaire (FFQ). The frequency included never or rarely, 1–2 times a week, 3–6 times a week, and more than once per day (never or rarely = 0 times/day; 1–2 times a week = 0.2/day; 3–6 times a week = 0.6/day; more than once per day = 1/day) (20). The serving sizes were described by natural portions or standard weight/volume (20).
The score was obtained by referring to the MD score modified by Bédard et al. (7). The median weekly intake of food groups was the basis of the score. Based on 39 pre-defined food groups in our study, the relevant food groups were selected and divided into six beneficial food groups (vegetables, legumes, fruits and nuts, cereal, fish, and dairy) and one detrimental food group (meat). When consumption of the beneficial food group was above the median, mothers scored 1 point, and those below the median scored 0 points. The opposite is true for meat consumption. The MD score was calculated by summing the values of the seven food groups and it ranged from 0 to 7. We divided it into low (0-3) score and high (4-7) score groups, and the high score group represented greater adherence to a Mediterranean-style diet.
Outcome assessment
Developmental delays in the infant at 12 months were evaluated by the ASQ-3. The prematurity age has been adjusted by a standardized ASQ-3 age calculator administered (21). Mothers were responsible for completing this questionnaire, and they were helped by trained investigators when they could not understand the questions clearly.
The ASQ-3 is validated to screen for delays in five domains (communication, gross motor, fine motor, personal–social functioning, and problem-solving ability). Each question had three choices (“yes,” “sometimes,” and “not yet”). If infants demonstrated the ability to do the specific activity described by the item, mothers could choose “Yes” and get 10 points. “Sometimes” marked that the skill was emerging and corresponded to 5 points, and “not yet” indicated that the child had not yet shown the ability to do that specific activity and scored 0 points. We calculated the sum of the scores for each domain and then defined cutoff points based on their scores (reducing the mean score by two standard deviations). Infants were thought to “fail” the screening for potential developmental delays when their scores were below the cutoff points (16). “Any fail” meant that the infants failed in at least one ASQ-3 domain.
Cord serum metabolic markers measures
The previous collected venous cord blood samples were detected for cord serum metabolic markers, including C-peptide, high-density lipoprotein (HDL)-cholesterol, low-density lipoprotein (LDL)-cholesterol, total cholesterol (TC), and triacylglycerol (TG). The levels of serum C-peptide were tested by an immunoassay (Auto DELFIA, PerkinElmer). Cord blood HDL-cholesterol, LDL-cholesterol, TC, and TG were measured using an automatic analyzer (Beckman Coulter, Brea, CA, USA).
Potential covariates
Potential covariates were considered characteristics that have an established or potential association with exposures or outcomes of interest, including (A) characteristics of pregnant women: mothers' age at delivery (< 30 and ≥30 years), education (≤ 12 and >12 years), household income (< 6,000 and ≥6,000 yuan), gravidity and parity history, pre-pregnancy body mass index (BMI; < 24 kg/m2 and ≥24 kg/m2), gestational diabetes (yes and no), blood pressure (systolic and diastolic), anemia during pregnancy (yes and no), depressive symptom (yes and no), the frequency of physical exercise, and the supplement of vitamin D, folic acid, and iron and (B) infant characteristics: mode of delivery (cesarean section and eutocia), birth weight, gender, delivery pregnancy week, and infant feeding status at 6 months (exclusive breastfeeding and other feedings).
Statistical analysis
The distributions of the maternal and infant variables across the maternal MD score categories (high score vs. low score) were compared using the chi-square tests for categorical variables and t-tests for continuous variables, and we used the same method to compare the difference of variables between completed follow-up and lost follow-up.
The association of MD scores (categorical and continuous) with developmental delay in infants was shown based on the chi-square tests and logistic regression. Stratified logistic analyses were used to estimate the association of MD score with ASQ-3 failures according to infant gender. Stratified multiple linear regression analyses were used to estimate the association of MD score and continuous metabolic markers according to infant gender.
Cord serum C-peptide of >90th percentile was used for the diagnosis of fetal hyperinsulinemia (22, 23), which was usually used to divide continuous C-peptide into categorical variables. For the cord blood lipids, referring to correlative studies, we used the 75th percentile as the cutpoint finally (24, 25), and the percentiles were produced through all participants. Then, we used logistic regression to assess the relationship between the categorical MD score and categorical cord blood markers and the associations of categorical cord blood markers with ASQ-3 failures.
Mediation analysis was completed using the SPSS PROCESS plug-in. We evaluated the role of log-transformed C-peptide in the relationship between maternal MD score and the failure of the communication domain. In the sensitivity analysis, we conducted the association between MD score with the failure of communication domain in different pre-pregnancy BMI subgroups and GDM (yes and no) subgroups, and stratified logistic regression was used for sensitivity analysis. All analyses were performed using SPSS version 26.0 software (IBM Corp, Armonk, NY, United States).
Results
Bivariate descriptive analysis (Table 1) revealed that mothers in the high MD score group (n = 578) were more highly educated, with higher household incomes and more frequent physical exercise than those in the low MD score group (n = 893). Meanwhile, their children scored higher in communication, fine motor, and personal social domain. When we compared the characteristics between mothers included in the study and those excluded, the result revealed that those excluded were younger and had lower education levels (Supplementary Table 1).
Table 1. Characteristics of mothers and infants.
Maternal MD and ASQ failure of infants
Compared with the low score group, the high score group was less likely to be ASQ-3 failure in the communication domain (2.6 vs. 7.4%, P < 0.001), problem-solving domain (1.9 vs. 3.8%, P = 0.038), personal–social domain (2.1 vs. 5.4%, P = 0.002), and any failure (11.8 vs. 17.4%, P = 0.003) (Table 2). In unadjusted analyses (Model 1), the higher MD score was associated with lower RR for the developmental delays in infants at 12 months in the communication domain [RR with 95% CI: 0.33 (0.19, 0.59)], problem-solving domain [RR with 95% CI: 0.49 (0.25, 0.98)], personal–social domain [RR with 95% CI: 0.37 (0.20, 0.71)], and any failure [RR with 95% CI: 0.63 (0.47, 0.86)]. This association remained in the communication domain [RR with 95% CI: 0.30 (0.14, 0.64)] and personal–social domain [RR with 95% CI: 0.40 (0.17, 0.95)] after controlling for some potential confounders (Model 2). When we controlled more potential confounders, there is only the relationship between the MD score and the communication domain [RR with 95% CI: 0.34 (0.16, 0.72)] which proved to be meaningful (Model 3).
Table 2. Associations of Mediterranean diet score during pregnancy with developmental delays in infants at 12 months.
The role of cord serum markers in the association between maternal MD and ASQ-3 failure of infants
In addition, our study showed that the associations of MD scores with cord serum markers and associations of cord serum markers with ASQ-3 failures were meaningful (Figure 1). Mothers with low MD scores had an increased risk of higher cord serum marker levels in adjusted analyses the C-peptide level above the 90th percentile [RR with 95% CI: 0.72 (0.56, 0.92)], the LDL-cholesterol level above the 75th percentile [RR with 95% CI: 0.80 (0.68, 0.95)], the total cholesterol level above the 75th percentile [RR with 95% CI: 0.77 (0.65, 0.91)], and the HDL-cholesterol level above the 75th percentile [RR with 95% CI: 0.82 (0.67, 0.97)], except for triacylglycerol level above the 75th percentile [RR with 95% CI: 0.99 (0.85, 1.17)]) (Figure 1A). When the relationship between cord serum metabolic markers and ASQ-3 failures were analyzed, we found that only the cord serum C-peptide level above the 90th percentile and the failure of the communication domain was significative [RR with 95% CI: 2.90 (1.28, 5.69)] (Figure 1B). Furthermore, we analyzed that the influence of MD during pregnancy on log-transformed cord serum C-peptide behaves differently by gender [β with 95% CI for boys: −0.028 (−0.055, −0.001); for girls: −0.003 (−0.029, 0.024)] (Supplementary Table 2). There were no significant differences for the ASQ-3 failure to other cord serum metabolic markers (Supplementary Figure 2).
Figure 1. Associations of Mediterranean diet score with cord blood markers and associations of cord blood markers with ASQ-3 failures. (A) RRs with 95% CI for the dichotomous outcomes of cord blood level are for Mediterranean diet score (4–7 vs. 0–3). (B) RRs with 95% CI for the dichotomous outcomes of ASQ-3 failures including communication domain, gross motor domain, fine motor domain, problem-solving domain, personal social domain, and any failure for the cord C-peptide level above the 90th percentile. Both (A, B) adjusted confounders including maternal age, education, household income, pre-pregnancy BMI, gestational diabetes, blood pressure (systolic and diastolic), anemia during pregnancy, depressive symptoms, pregnancy history, maternal physical exercise, and the supplement of nutrients, such as vitamin D, folic acid, and iron, and (B) additionally adjusted delivery mode, gender, gestational week, and birth weight, and the patterns of infant feeding.
Investigation to explore gender-specific associations
In addition, we revealed that the incidence of ASQ-3 failures differed between boys and girls. Boys' ASQ-3 failures are characteristics of high incidence than girls' in the communication domain (9.8 vs. 3.1%, P < 0.001), personal–social domain (6.8 vs. 2.5%, P = 0.006), and any failure (20.2 vs. 12.4%, P = 0.004). When we stratified/interacted with the analyses of the MD and ASQ-3 failures by children gender, the maternal MD was significantly associated with the communication domain only among boys [RR with 95% CI: 0.34 (0.14, 0.84)] but not among girls [RR with 95% CI: 0.26 (0.06, 1.18)] after adjusting for confounders (Table 3).
Table 3. Gender-specific effects on the relationship of Mediterranean diet score (4–7 vs. 0–3) with ASQ-3 failures.
Sensitivity analysis and mediation analysis
In sensitivity analyses, our study showed that the maternal high MD score could improve those infants' communication domain born to mothers with pre-pregnancy BMI of < 24 kg/m2 or without GDM (Figure 2). Finally, the mediation analysis revealed the contribution of maternal MD to the failure of the communication domain mediated by the log-transformed cord serum C-peptide [indirect effect in all infants with 95% CI: −0.070 (−0.472, −0.017); indirect effect in boys with 95% CI: −0.163 (−0.894, −0.016) and in girls with 95% CI: −0.015 (−0.231, 0.095)] (Figure 3).
Figure 2. Communication domain failure in infants born to mothers with low Mediterranean diet score vs. high Mediterranean diet score. RR with 95% CI for the dichotomous outcomes of communication domain failure is for Mediterranean diet score during pregnancy (4–7 vs. 0–3). Adjusted confounders included maternal age, education, household income, blood pressure (systolic and diastolic), anemia during pregnancy, depressive symptoms, maternal physical exercise, the supplement of nutrients, such as vitamin D, folic acid, and iron, pregnancy history, delivery mode, gender, gestational week, k, birth weight, and the patterns of infant feeding.
Figure 3. Mediation effects of cord C-peptide (loge transformed) on the relationship between maternal Mediterranean diet score and failing the communication domain. (A–C) Adjusted confounders included maternal age, education, household income, pre-pregnancy BMI, gestational diabetes, blood pressure (systolic and diastolic), anemia during pregnancy, depressive symptoms, maternal physical exercise, the supplement of nutrients, such as vitamin D, folic acid, and iron, pregnancy history, delivery mode, gestational week, birth weight, and patterns of infant feeding.
Discussion
In this prospective birth cohort study, compared with infants whose mothers have low MD scores, infants whose mothers have high MD scores had lower risks of ASQ-3 failure in the communication, problem-solving, and personal–social domain in the unadjusted model. After adjusting confounders, the association remained for the communication domain. A significant gender-specific effect in the association was observed. MD during pregnancy appears to protect neurodevelopment in boys significantly rather than in girls. Furthermore, the relationship between low MD scores and the failure of the communication domain in boys may be partly mediated by cord serum C-peptide.
As a western dietary pattern, MD was associated with reduced risks of adverse pregnancy outcomes (26), but these associations in Chinese mother–infant pairs are uncertain. Research shows that higher adherence to the MD has been relevant to better blood glucose regulation during pregnancy, lower risk of preterm birth, and lower incidence of fetal growth restriction (27). Recent evidence raised concerns about the association between dietary and personal cognitive function, mood, behavior, and neurodevelopment (28–31). The potential protective impacts of the Mediterranean diet on offspring neurodevelopment during pregnancy may be due to the consumption of beneficial foods (vegetables, legumes, fruits and nuts, cereal, fish, and dairy) or nutrients (such as omega-3 fatty acids). An RCT study found that infants of mothers who had eaten 200 g of cod two times a week for 16 weeks had a better cognitive composite compared with the control group (31). A diet rich in omega-3 fatty acids may support neurodevelopment in humans (32). Therefore, our study extended previous work for dietary guidelines during pregnancy.
Evidence presented that MD was related to maternal glucose metabolism during pregnancy (12, 13). Data exhibited that maternal metabolism may play an important role in children's neurodevelopment (23, 33, 34). However, information linking cord blood metabolism and infant neurodevelopment is lacking (16). In this context, we found that cord serum C-peptide may be the mediator in the correlation between maternal MD and failure of the communication domain. Although high cord C-peptide has been proven to contribute to some adverse outcomes (for example, poor neurodevelopmental, slower growth rate, and childhood adiposity) (23, 35, 36), our study is the first to highlight the association of metabolic regulation between maternal diet and infant neurodevelopment. Animal and epidemical studies found that the elevating levels of serum C-peptide might contribute to the abnormality of the nitric oxide signaling pathway and glucose homeostasis, which might explain the impaired brain structure and function (37–39).
Furthermore, epidemiological and animal studies showed that boys may be more sensitive to suboptimal intrauterine exposure (19). Potential gender-specific sensitivity might lead to profound and lasting differential long-term health consequences. Nonetheless, evidence on gender dimorphism relationships between diet and infant development is limited. The association between MD and infant neurodevelopment was significant in boys but not girls. While our results were partly limited to the sample size and seemed no significant difference in interaction analysis, we reported for the first time the potential gender-specific impacts on the association between maternal MD and neurodevelopmental outcomes, and our study showed that maternal MD could not affect the cord serum C-peptide levels in girls. Therefore, the gender difference in MD affecting neurodevelopment may be explained by this metabolic pathway.
Strengths and limitations
This study has several strengths. The population-based prospective cohort study has rich information on sociodemographic characteristics, which helped reduce residual confounding. Moreover, different from a single nutrient, the use of dietary patterns captured the overall quality of the diet. Meanwhile, our study highlights that cord serum metabolites could play a mediation role in infant neurodevelopment. Furthermore, gender-specific was observed in association analysis and mediation analysis.
Several potential limitations merit discussion. First, ASQ-3 was used but lacked systematic neurodevelopmental assessments. Nonetheless, the ASQ-3 was demonstrated to identify early developmental delays and has an intimate correlation with the Bayley Scale of Infant and Toddler Development, Third Edition (Bayley-III) (40). Second, measurement errors in dietary assessments are also a concern. The FFQ relies considerably on the participants' memory and could be subject to recall errors. However, FFQ remains the most appropriate tool for assessing dietary data in epidemiological studies (41). Third, only several conventional cord metabolic markers (including C-peptide, high-density lipoprotein-cholesterol, low-density lipoprotein-cholesterol, total cholesterol, and triglycerides) were measured in this cohort study due to the limited research funding. More markers such as glucose and leptin would be added in future studies. Finally, we did not consider the influence of complementary foods, but we adjusted for the infant feeding patterns.
Conclusion
In this prospective birth cohort study, infants born to mothers who adhere to the Mediterranean diet during pregnancy may have better neurodevelopment. We found novel evidence that the possible mechanism being greater adherence to an MD in pregnancy may mean lower cord serum C-peptide, which is associated with better neurodevelopment in infants. These results have important implications for targeting prevention in improving maternal and fetal outcomes.
Data availability statement
The original contributions presented in the study are included in the article/Supplementary material, further inquiries can be directed to the corresponding authors.
Ethics statement
The studies involving human participants were reviewed and approved by the Ethics Committee of Anhui Medical University (number: 20180092). The patients/participants provided their written informed consent to participate in this study.
Author contributions
F-cD collected and analyzed data and wrote the manuscript. PW provided input in terms of statistical analysis and critically reviewed the manuscript. QL, LZ, L-jY, and LW were responsible for collecting data and contributing to clinical assessments. R-xT designed the study and assisted with the data collection. PZ designed the study, was involved in the baseline and follow-up supervision, and critically reviewed the manuscript. All authors have read and approved the final manuscript.
Funding
This research received financial support from the National Natural Science Foundation of China (82173531 and 81872631), the National Key R&D Program of China (2022YFC2702901), and the Foundation for Scientific Research Improvement of Anhui Medical University (2021xkjT009).
Acknowledgments
We gratefully acknowledge the contribution of the participating mothers, the Department of Obstetrics and Gynecology, Hefei Maternal and Child Health Hospital, Hefei First People's Hospital, and the First Affiliated Hospital of Anhui Medical University, Hefei, China, for assistance and support in the study.
Conflict of interest
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
Publisher's note
All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.
Supplementary material
The Supplementary Material for this article can be found online at: https://www.frontiersin.org/articles/10.3389/fnut.2022.1078481/full#supplementary-material
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Keywords: Mediterranean diet, pregnancy, infant, neurodevelopment, birth cohort
Citation: Dai F-c, Wang P, Li Q, Zhang L, Yu L-j, Wu L, Tao R-x and Zhu P (2023) Mediterranean diet during pregnancy and infant neurodevelopment: A prospective birth cohort study. Front. Nutr. 9:1078481. doi: 10.3389/fnut.2022.1078481
Received: 24 October 2022; Accepted: 28 December 2022;
Published: 16 January 2023.
Edited by:
Yuan Lin, Nanjing Medical University, ChinaCopyright © 2023 Dai, Wang, Li, Zhang, Yu, Wu, Tao and Zhu. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Rui-xue Tao, 
ruixuetao123@163.com; Peng Zhu, zhup_ahmu@163.com
†These authors have contributed equally to this work and share first authorship