title: Postpartum lactational amenorrhoea as a means of family planning in the Sudan: a study of 500 cases.
mesh_terms: D000293:Adolescent; D000328:Adult; D000568:Amenorrhea / Q000453:epidemiology*; D005193:Family Planning Services; D005260:Female; D006801:Humans; D007774:Lactation; D008875:Middle Aged; D049590:Postpartum Period; D011247:Pregnancy; D012189:Retrospective Studies; D013397:Sudan; D013997:Time Factors