Epidemiology of congenital defects. Methodology.
D000367:Age Factors; D001789:Blood Group Antigens; D000013:Congenital Abnormalities / Q000453:epidemiology*; D004812:Epidemiologic Methods; D005006:Ethnicity; D005247:Feeding Behavior; D005260:Female; D006306:Health Surveys; D006801:Humans; D008423:Maternal Age; D009790:Occupations; D010298:Parity; D044469:Racial Groups; D012067:Religion; D012621:Seasons; D012959:Socioeconomic Factors; D014171:Transients and Migrants
D001789:Blood Group Antigens