Microcomputers and the work of a medical officer for environmental health at district.
D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D002675:Child, Preschool; D003140:Communicable Disease Control; D003154:Community Medicine; D003201:Computers; D004739:England; D004782:Environmental Health; D006801:Humans; D007223:Infant; D008499:Medical Records; D008838:Microcomputers; D008875:Middle Aged; D012424:Rural Population