1. Division of Cardiovascular Medicine, SUNY Downstate Medical Center, Brooklyn, New York 11203.
2. Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland 21218.
3. Department of Preventive Medicine and Community Health, SUNY Downstate Medical Center, Brooklyn, New York 11203.
4. Departments of Medicine and Epidemiology, Montefiore Medical Center and Albert Einstein College of Medicine, Bronx, New York 10567.