Choanal atresia; lessons from five cases.
D001238:Asphyxia Neonatorum / Q000209:etiology; D002404:Catheterization; D000013:Congenital Abnormalities / Q000175:diagnosis* / Q000453:epidemiology; D006801:Humans; D007231:Infant, Newborn; D007234:Infant, Premature; D009666:Nose / Q000002:abnormalities* / Q000000981:diagnostic imaging / Q000601:surgery; D011859:Radiography