title: The problems of mental subnormality in a developing country.
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D002675:Child, Preschool; D003906:Developing Countries; D004519:Education, Special; D005260:Female; D006306:Health Surveys; D006801:Humans; D007223:Infant; D008607:Intellectual Disability / Q000209:etiology / Q000517:prevention & control*; D008297:Male; D012846:Singapore