Columbia subject headings:
Birth control--Evaluation--Methodology.
Birth control--Research--Developing countries.
Family size--Developing countries--Statistics.
Harvard subject headings:
Birth control--Evaluation--Methodology.
Birth control--Research--Developing countries.
Family size--Developing countries--Statistics.
Princeton subject headings:
Birth control--Developing countries--Research.
Birth control--Evaluation--Methodology.
Family size--Developing countries--Statistics.