The effects of subclinical bilharziasis on mental ability in schoolchildren.
D000293:Adolescent; D001077:Aptitude Tests; D002648:Child; D005260:Female; D005500:Follow-Up Studies; D006266:Health Education; D006801:Humans; D008297:Male; D008606:Mental Processes; D011581:Psychological Tests; D012552:Schistosomiasis / Q000453:epidemiology / Q000503:physiopathology* / Q000628:therapy; D012923:Social Class; D015030:Zimbabwe