1. World Health Organization (WHO). Medical eligibility criteria for contraceptive use. Geneva: WHO, 2009. http://www.spdc.pt/files/publicacoes/5_11292_2.pdf (accessed 2 Nov 2017).
2. World Health Organization (WHO). Family planning. A global handbook for providers. Evidence-based guidance developed through worldwide collaboration. Baltimore and Geneva: Department of Reproductive Health and Research and Johns Hopkins Bloomberg School of Public Health Center for Communication Programs, and WHO, 2011. http://apps.who.int/iris/bitstream/10665/44028/1/9780978856373_eng.pdf (accessed 2 Nov 2017).
3. Faculty of Family Planning and Reproductive Health Care (FSRH) Clinical Effectiveness Unit. First prescription of combined oral contraception. London: FSRH, 2006.
4. SOGC clinical practice guidelines: Canadian contraception consensus;Black;J Obstet Gynaecol Can,2004
5. Pelvic Examinations and Access to Oral Hormonal Contraception