[1] Univ Colorado, Obstet & Gynecol, Aurora, CO USA
[2] Duke Univ, Biostat, Durham, NC USA
[3] Ohio State Univ, Obstet & Gynecol, Columbus, OH USA
[4] Washington Univ, Obstet & Gynecol, St Louis, MO USA
[5] Univ Oklahoma, Obstet & Gynecol, Oklahoma City, OK USA
[6] NYU, Obstet & Gynecol, New York, NY USA
[7] Duke Univ, Gynecol Oncol, Durham, NC USA
[8] Univ Alabama Birmingham, Obstet & Gynecol, Birmingham, AL USA
[9] Univ Cincinnati, Obstet & Gynecol, Cincinnati, OH USA
[10] Columbia Univ, Obstet & Gynecol, New York, NY USA
[11] UCLA, Obstet & Gynecol, Los Angeles, CA USA
[12] LSU, Obstet & Gynecol, New Orleans, LA USA
[13] Univ Penn, Obstet & Gynecol, Philaldelphia, PA USA
[14] Univ Virginia, Obstet & Gynecol, Charlottesville, VA USA
[15] UCLA, Ob Gyn, Los Angeles, CA USA
[16] Johns Hopkins Univ, Obstet & Gynecol, Baltimore, MD USA