[EPIDEMIOLOGICAL SURVEY OF OLIGOPHRENIAS IN PORTUGAL. (PRELIMINARY NOTE)].
D000293:Adolescent; D002648:Child; D003625:Data Collection; D006306:Health Surveys; D006801:Humans; D008607:Intellectual Disability; D011174:Portugal
ADOLESCENCE; CHILD; HEALTH SURVEYS; MENTAL RETARDATION; PORTUGAL
PROSPEC C AO EPIDEMIOL'OGICA DAS OLGOFRENIAS EM PORTUGAL. (NOTA PR'EVIA)