Blindness in the Luapula valley.
D001766:Blindness / Q000453:epidemiology* / Q000209:etiology; D002648:Child; D002675:Child, Preschool; D006801:Humans; D012899:Smallpox / Q000150:complications; D014802:Vitamin A Deficiency / Q000150:complications; D015024:Zambia