por Singh, Susheela David [autor] | Wulf, Deirdre [autor] | Guttmacher Institute.
por Tietze, Christopher [autor] | Henslhaw, Stanley K [autor] | Guttmacher Institute.
por Alan Guttmacher Institute | Planned Parenthood Federation of America. Family Planning International Assistance Division | Estados Unidos. Agency for International Development.
por Alan Guttmacher Institute.
por Jones, Elise F | Yale University | Guttmacher Institute.