Jun Zhang, Helain J. Landy, D. Ware Branch, Ronald Burkman, Shoshana Haberman, Kimberly D. Gregory, Christos G. Hatjis, Mildred M. Ramirez, Jennifer L. Bailit, Victor H. Gonzalez-Quintero, Judith U. Hibbard, Matthew K. Hoffman, Michelle Kominiarek, Lee A. Learman, Paul Van Veldhuisen, James Troendle, Uma M. Reddy
Obstet Gynecol.
Author manuscript; available in PMC 2013 May 21.Published in final edited form as: Obstet Gynecol. 2010 Dec; 116(6): 1281–1287. doi: 10.1097/AOG.0b013e3181fdef6e