American Journal of Obstetrics and Gynecology
American Journal of Obstetrics and Gynecology > 2005 > 192 > 5 > 1592-1598
American Journal of Obstetrics and Gynecology > 2005 > 193 > 6 > 2088-2093
American Journal of Obstetrics and Gynecology > 2008 > 199 > 6 > 671.e1-671.e6