European Journal of Obstetrics & Gynecology and Reproductive Biology
European Journal of Obstetrics and Gynecology > 2013 > 169 > 2 > 257-260
European Journal of Obstetrics and Gynecology > 2013 > 169 > 2 > 252-256
European Journal of Obstetrics and Gynecology > 2013 > 170 > 1 > 157-161