International Journal of Gynecology & Obstetrics
International Journal of Gynecology and Obstetrics > 2012 > 117 > 2 > 140-143
International Journal of Gynecology and Obstetrics > 2012 > 118 > 3 > 202-204
International Journal of Gynecology and Obstetrics > 2012 > 119 > 3 > 227-233