1. Women's Heart Center, The Cedars-Sinai Heart Institute, and Department of Medicine, Cedars-Sinai Research Institute, Cedars-Sinai Medical Center, Los Angeles, California.
2. Hartford Hospital, Department of Cardiology, University of Southern California, Los Angeles, California.
3. Departments of Obstetrics and Gynecology and Preventive Medicine, Keck School of Medicine, University of Southern California, Los Angeles, California.