The homeless.
D000328:Adult; D000368:Aged; D003156:Community Mental Health Services; D003625:Data Collection; D003688:Deinstitutionalization; D006301:Health Services Needs and Demand; D006302:Health Services Research; D006703:Ill-Housed Persons; D006801:Humans; D008875:Middle Aged; D011640:Public Policy; D014481:United States