title: Twin recurrence and amniocentesis: male and MZ heritability factors.
mesh_terms: D000649:Amniocentesis; D000013:Congenital Abnormalities / Q000175:diagnosis; D005260:Female; D005826:Genetics, Medical; D006801:Humans; D008297:Male; D010375:Pedigree; D011247:Pregnancy; D012737:Sex Factors; D013223:Statistics as Topic; D014427:Twins; D014430:Twins, Monozygotic; D014463:Ultrasonography