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Bönig, H., Däublin, G., Schwahn, B. et al. Psychotic symptoms in severe MTHFR deficiency and their successful treatment with betaine. Eur J Pediatr 162, 200–201 (2003). https://doi.org/10.1007/s00431-002-1148-9
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DOI: https://doi.org/10.1007/s00431-002-1148-9