Epidemiology: first-hand study by community health nurses.
D000328:Adult; D002648:Child; D002675:Child, Preschool; D003152:Community Health Nursing / Q000193:education*; D004508:Education, Nursing, Baccalaureate; D004812:Epidemiologic Methods; D004813:Epidemiology / Q000193:education*; D006801:Humans; D007223:Infant; D007855:Lead Poisoning / Q000097:blood / Q000517:prevention & control*; D012106:Research