1. United Nations, Department of Social and Economic Development, Population Division. http://www.un.org/esa/population/publications/contraceptive2011/wallchart_front.pdf (Accessed Oct 3, 2013).
2. Depot-medroxyprogesterone acetate ((DMPA) and risk of endometrial cancer;World Health Organization;In J of Cancer,1991
3. Effects of contraception on hemoglobin and ferritin;World Health Organization;Contraception,1998
4. Scientists and the media must give a balanced view;Shelton;Nature,2011
5. Long-acting injectable progesting contraception and risk of type 2 diabetes in Latino women with prior gestational diabetes mellitus;Xiang;Diab Care,2006