Erika F. Werner, Teresa M. Janevic, Jessica Illuzzi, Edmund F. Funai, David A. Savitz, Heather S. Lipkind
Obstet Gynecol.
Author manuscript; available in PMC 2013 Jul 29.Published in final edited form as: Obstet Gynecol. 2011 Dec; 118(6): 1239–1246. doi: 10.1097/AOG.0b013e31823835d3