[Neonatal defects in 18,158 parturitions in the Chengdu area].
D000015:Abnormalities, Multiple / Q000453:epidemiology; D002681:China; D000013:Congenital Abnormalities / Q000453:epidemiology*; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D008297:Male; D012621:Seasons; D013383:Suburban Population; D011795:Surveys and Questionnaires; D014505:Urban Population