American Journal of Obstetrics and Gynecology
American Journal of Obstetrics and Gynecology > 2006 > 194 > 1 > 26-42
American Journal of Obstetrics and Gynecology > 2006 > 194 > 4 > 982-991
American Journal of Obstetrics and Gynecology > 2006 > 195 > 6 > 1794-1798