Erratum to: Langenbecks Arch Surg (2010) 395:65–71

DOI 10.1007/s00423-008-0437-9

The original version of this article by Haveman et al. unfortunately contained an error concerning the statistical analysis. The 95 % confidence interval (CI) reported in this publication was 26–130 months, not 13-79 months as initially reported.

The correct results are as follows:

We calculated the median operation free period between the first and second operation. This operation free period increased from 21 months (95 % CI: 10–33 months) for patients operated before 2000 to 78 months (95 % CI: 26–130 months) for patients operated in or after 2000 (p = 0.039; log-rank test, see Fig. 2).