Birth control Demographic surveys--Egypt Egypt--Population_-Statistics Fertility, Human--Egypt Health surveys--Egypt 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--Tanzania--Mortality Contraception Contraception--Africa South of the Sahara --statistics Contraception--Research--Methodology Contraceptives Demographic surveys Demographic surveys--Developing countries Demographic surveys--Nigeria Demographic surveys--Turkey Demographic surveys--Uganda Diarrhea in children Failures Family life surveys--Developing countries Family life surveys--Methodology Fertility, Human Fertility, Human--Africa, Sub-Saharan --Statistics Fertility, Human--Nigeria--Statistics Fertility, Human--Research--Developing countries