1. Department of Epidemiology, University of Pittsburgh, Pittsburgh, Pennsylvania.
2. Division of Reproductive Endocrinology, Albert Einstein College of Medicine, Bronx, New York.
3. Department of Epidemiology, University of Michigan, Ann Arbor, Michigan.
4. Division of Cardiology, Department of Medicine, Cedars-Sinai Research Institute, Cedars-Sinai Medical Center, Los Angeles, California.