title: Population-based study of sex proportion in monoamniotic twins.
authors: C
authors: C
authors: Derom
authors: R
authors: R
authors: Vlietinck
authors: R
authors: R
authors: Derom
authors: H
authors: H
authors: Van den Berghe
authors: M
authors: M
authors: Thiery
mesh_terms: D000650:Amnion; D002823:Chorion; D005260:Female; D006801:Humans; D008297:Male; D012744:Sex Ratio; D014427:Twins; D014430:Twins, Monozygotic