1. Departments of Epidemiology and Medicine, and Welch Center for Prevention, Epidemiology, and Clinical Research, Johns Hopkins University Bloomberg School of Public Health, Baltimore, MD (D.Z., W.S.P., E.B.-C., E.D.M., E.G.).
2. Division of Cardiology, Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD (W.S.P., A.C., E.D.M.).
3. Medtronic Inc, Minneapolis, MN (A.C.).
4. Division of General Medicine, Department of Medicine, Columbia University, New York, NY (Y.Z.).
5. Division of Cardiovascular Medicine, Department of Medicine, University of Pennsylvania, Philadelphia (R.D.).
6. National Center for Epidemiology, Carlos III Institute of Health and Consortium for Biomedical Research in Epidemiology and Public Health, Madrid, Spain (R.P.-B.).
7. Division of Cardiology, Cardiovascular Health Research Unit, University of Washington, Seattle (N.S.).