1 Center for Reproductive Health, Department of Obstetrics and Gynecology, MetroHealth Medical Center, Case Western Reserve University School of Medicine, Cleveland, OH 44109. Electronic address: pcatalano@tuftsmedicalcenter.org.
2 Friedman School of Nutrition Science and Policy, Maternal Infant Research Institute, Tufts University, 800 Washington Street, Box 394, Boston, MA 02111.