Determinants of natural fertility in Sudan.
D000293:Adolescent; D000328:Adult; D000568:Amenorrhea / Q000209:etiology; D001721:Birth Intervals; D001942:Breast Feeding; D003268:Contraception Behavior; D005260:Female; D005298:Fertility; D006801:Humans; D008393:Marriage; D008875:Middle Aged; D049590:Postpartum Period; D011247:Pregnancy; D013397:Sudan; D013997:Time Factors