1. Trends in contraceptive need and use in developing countries in 2003, 2008, and 2012: an analysis of national surveys;Darroch;Lancet,2013
2. Injectable contraception;Kaunitz;Clin Obstet Gynecol,1989
3. Use of contraception and use of family planning services in the United States;Mosher;Adv Data,1982
4. Births: final data for 2007;Martin;Natl Vital Stat Rep,2010
5. Teenagers in the United States: sexual activity, contraceptive use, and childbearing;Abma;Vital Health Stat 23,2002