Rayburn, William F. MD; Zhang, Jun MD, PhD
Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, School of Medicine, University of New Mexico, Albuquerque, New Mexico; and Epidemiology Branch, National Institute of Health and Human Development, National Institutes of Health, Bethesda, Maryland
Address reprint requests to: William F. Rayburn, MD, University of New Mexico Health Sciences Center, Department of Obstetrics and Gynecology, 2211 Lomas Boulevard NE (ACC 4), Albuquerque, NM 87131–5286; E-mail: [email protected].
Received December 28, 2001. Received in revised form March 1, 2002. Accepted March 14, 2002.