Umbilical hernia in Nigerian children of different socio-economic status.
D000293:Adolescent; D002648:Child; D003695:Delivery of Health Care; D005260:Female; D006262:Health; D006554:Hernia, Umbilical / Q000453:epidemiology*; D006801:Humans; D007223:Infant; D007227:Infant Nutritional Physiological Phenomena; D008297:Male; D009549:Nigeria; D012494:Sampling Studies; D012923:Social Class; D014330:Tropical Medicine