Creanga A A, Ahmed S, Genadry R R, Stanton C
Department of Population, Family and Reproductive Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA.
Int J Gynaecol Obstet. 2007 Nov;99 Suppl 1:S151-4. doi: 10.1016/j.ijgo.2007.06.037. Epub 2007 Sep 14.