When the "patient" is a whole community.
Walker
E H
EH
Neunzert
C B
CB
D000163:Acquired Immunodeficiency Syndrome / Q000517:prevention & control; D000293:Adolescent; D000328:Adult; D002654:Child Care; D002675:Child, Preschool; D005260:Female; D006266:Health Education / Q000458:organization & administration*; D006801:Humans; D008297:Male; D011247:Pregnancy; D011253:Pregnancy in Adolescence; D011637:Public Health Nursing / Q000379:methods*; D012424:Rural Population