Division of Reproductive Health, National Center for Chronic Disease Prevention and Health, Promotion (2013 Jun 21). ""U.s. Selected practice recommendations for contraceptive use, 2013: adapted from the world health organization selected practice recommendations for contraceptive use, 2nd edition."". MMWR. Recommendations and reports : Morbidity and mortality weekly report. Recommendations and reports / Centers for Disease Control 62 (RR-05): 1-60.