American Journal of Obstetrics and Gynecology
American Journal of Obstetrics and Gynecology > 1998 > 179 > 6 Part 1 > 1612-1617
American Journal of Obstetrics and Gynecology > 2006 > 194 > 1 > 127-130
American Journal of Obstetrics and Gynecology > 2009 > 200 > 4 > 440.e1-440.e5
American Journal of Obstetrics and Gynecology > 2010 > 203 > 4 > 391.e1-391.e5