Division of Maternal-Fetal Medicine, Department of Obstetrics, Gynecology and Reproductive Sciences, University of California, San Francisco, California; the Department of Obstetrics and Gynecology, Oregon Health & Science University, Portland, Oregon; and the Department of Family Medicine, Penn State Hershey Medical Center, Hershey, Pennsylvania.
Corresponding author: Yvonne W. Cheng, MD, PhD, Division of Maternal-Fetal Medicine, Department of Obstetrics, Gynecology and Reproductive Sciences, University of California, San Francisco, 505 Parnassus Avenue Box 0132, San Francisco, CA 94143; e-mail: [email protected].
Presented as an oral presentation at the Society for Maternal-Fetal Medicine Annual meeting, February 7–12, 2011, San Francisco, California.
Financial Disclosure The authors did not report any potential conflicts of interest.
