title: Adolescent reproductive health. An approach to planning health service research. Introduction.
mesh_terms: D000293:Adolescent; D000328:Adult; D000349:Africa; D001208:Asia; D005260:Female; D006302:Health Services Research; D006801:Humans; D007843:Latin America; D008297:Male; D011247:Pregnancy; D011253:Pregnancy in Adolescence; D011275:Pregnancy, Unwanted; D011320:Primary Health Care; D012749:Sexually Transmitted Diseases / Q000517:prevention & control