title: Causes of high twinning frequencies in Nigeria.
mesh_terms: D004032:Diet; D005006:Ethnicity; D005260:Female; D005640:Follicle Stimulating Hormone / Q000097:blood; D006801:Humans; D007231:Infant, Newborn; D009549:Nigeria; D011247:Pregnancy; D011272:Pregnancy, Multiple; D012606:Scotland; D012923:Social Class; D014427:Twins; D014429:Twins, Dizygotic
chemical_list: D005640:Follicle Stimulating Hormone