[1] Baylor Coll Med, Houston, TX 77030 USA
[2] Brigham & Womens Hosp, 75 Francis St, Boston, MA 02115 USA
[3] Harvard Med Sch, Beth Israel Deaconess Med Ctr, Boston, MA 02115 USA
[4] Univ Utah Hlth, Salt Lake City, UT USA
[5] Stanford Univ, Palo Alto, CA 94304 USA
[6] Vanderbilt Univ, Med Ctr, Nashville, TN USA
[7] Long Beach Mem Med Ctr Womens Hosp, Long Beach, CA USA
[8] Cooper Univ Hosp, Camden, NJ USA
[9] Beth Israel Deaconess Med Ctr, Dept Obstet & Gynecol, Boston, MA 02215 USA
[10] Texas Childrens Hosp, Baylor Coll Med, Houston, TX 77030 USA
[11] Univ Alabama Birmingham, Ctr Womens Reprod Hlth, Birmingham, AL USA
[12] Univ Calif Irvine, Orange, CA 92668 USA
[13] Univ Texas Southwestern Med Ctr Dallas, Dallas, TX 75390 USA
[14] Univ Alabama Birmingham, Birmingham, AL USA
[15] Texas Childrens Hosp, Baylor Coll Med, Dept Obstet & Gynecol, Houston, TX 77030 USA