1. Division of Epidemiology, Human Genetics and Environmental Sciences, University of Texas School of Public Health, Houston, TX 77030
2. Division of Epidemiology and Community Health, University of Minnesota, Minneapolis, MN 55454
3. Kyungpook National University, Seoul 0 700-422, South Korea
4. Department of Pathology, University of Vermont College of Medicine, Burlington, VT 05446
5. Department of Medicine, College of Physicians and Surgeons, and Department of Epidemiology, Mailman School of Public Health, Columbia University, New York, NY 10032
6. Department of Cardiology, John Hopkins University, Baltimore, MD 21205