title: Prevalence of umbilical hernia in African preschool children.
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D002675:Child, Preschool; D006554:Hernia, Umbilical / Q000453:epidemiology*; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D009549:Nigeria