American Journal of Obstetrics and Gynecology
American Journal of Obstetrics and Gynecology > 1997 > 177 > 4 > 849-852
American Journal of Obstetrics and Gynecology > 1997 > 177 > 5 > 1149-1155
American Journal of Obstetrics and Gynecology > 2004 > 191 > 4 > 1441-1445
American Journal of Obstetrics and Gynecology > 2005 > 193 > 3 Supplement > 1076.e1-1076.e9
American Journal of Obstetrics and Gynecology > 2006 > 194 > 5 > 1360-1365
American Journal of Obstetrics and Gynecology > 2011 > 204 > 3 > 221.e1-221.e8
American Journal of Obstetrics and Gynecology > 2013 > 208 > 3 > 194.e1-194.e8