title: Season and interval for recurrence of neural tube defects.
mesh_terms: D004200:Diseases in Twins; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D008297:Male; D009436:Neural Tube Defects / Q000235:genetics*; D011247:Pregnancy; D012306:Risk; D012737:Sex Factors; D013997:Time Factors; D014427:Twins