Influence of the socio-economic level on the conception rate during lactation.
D000568:Amenorrhea; D003906:Developing Countries; D005260:Female; D005306:Fertilization; D006801:Humans; D007774:Lactation; D008598:Menstruation; D010053:Ovary / Q000502:physiology; D011247:Pregnancy; D012189:Retrospective Studies; D012424:Rural Population; D012432:Rwanda; D012959:Socioeconomic Factors; D013223:Statistics as Topic; D014505:Urban Population