1. Department of Medicine and Section of Cardiovascular Research, Baylor College of Medicine, Houston, Texas
2. Aga Khan University, Karachi, Pakistan, and Baylor College of Medicine and Texas Heart Institute, Houston, Texas
3. Division of Cardiology, Johns Hopkins University School of Medicine, Baltimore, Maryland
4. Department of Medicine, Baylor College of Medicine; Section of Cardiovascular Research, Baylor College of Medicine; and Michael E. DeBakey Veterans Affairs Hospital, Houston, Texas
5. Emory Clinical Cardiovascular Research Institute, Emory University School of Medicine, Atlanta, Georgia
6. Division of Cardiovascular Medicine, Loma Linda University Medical Center, Loma Linda, California