Demographic surveys Fertility, Human Birth control Health surveys Birth control--Bangladesh--Statistics Contraceptives Demographic surveys--Bangladesh Demographic surveys--Egypt Demographic surveys--Turkey Egypt--Population_-Statistics Failures Fertility, Human--Bangladesh--Statistics Fertility, Human--Egypt Health surveys--Bangladesh Health surveys--Egypt Health surveys--Turkey Population Birth control--Africa, Sub-Saharan --Statistics Birth control--Nigeria--Statistics Birth control--Research--Developing countries Birth control--Research--Methodology Birth control--Uganda Birth control--Yemen--Statistics Children Children--India--Mortality Children--Tanzania--Mortality Contraception Contraception Behavior Contraception--Africa South of the Sahara --statistics Contraception--Research--Methodology