1. United Nations, Department of Economic and Social Affairs, Population Division, Population Estimates Projections Section. World population prospects: the 2012 revision; 2013. Available: https://esa.un.org/unpd/wpp/ . Accessed 15 Mar 2014.
2. Ezeh AC, Bongaarts J, Mberu B. Global population trends and policy options. Lancet. 2012;380(9837):142–8.
3. Stover J, Ross J. How increased contraceptive use has reduced maternal mortality. Matern Child Health J. 2010;14(5):687–95.
4. USAID. Strengthening Family Planning Policies and Program in Developing Countries An Advocacy Toolkit; 2005. Available: http://pdf.usaid.gov/pdf_docs/PNADH039.pdf . Accessed 20 Mar 2014.
5. Al JFE. Grandmultiparity: a potential risk factor for adverse pregnancy outcomes. J Reprod Med. 2012;57(1–2):53–7.