1. World Health Organization (WHO). Selected Practice Recommendations for Contraceptive Use,2002
2. A consensus process to adapt the World Health Organization Selected Practice Recommendations for UK use;Glasier, A.; Brechin, S.; Raine, R.; Penney, G.;Contraception,2003
3. Faculty of Family Planning and Reproductive Health Care (FFPRHC). UK Selected Practice Recommendations for Contraceptive Use;Update,2002
4. et al for the Methods Work Group, Third US Preventive Services Task Force. Current methods of the US Preventive Services Task Force: a review of the process;Harris, R.P.; Helfand, M.; Woolf, S.H.; Lohr, K.N.; Mulrow, C.D.; Teutsch, S.M.;Am J Prev Med,2001
5. Ovarian follicular development in oral contraceptive cycle;Killick, SR, Eyong; E, Elstein; M.;Fertil Steril,1987