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M.WuX.et al (2020)

N Engl J Med 360(8):765773

For example, if markers of vitamin B12 status do not show a clear-cut deficiency, Fedosov et al

52 Such damage may be caused by rare single-gene inborn errors of metabolism, by folate or retinoic acid deficiency, possibly related to ALDH mutations or ethanol ingestion during pregnancy, or by other, as yet, unidentified problems
