1. Department of Medicine, Mayo Clinic Health System, Mankato, MN, United States
2. Department of Medicine, New York Medical College, Metropolitan Hospital Center, NY, United States
3. Division of Cardiology, Emory University School of Medicine, Atlanta, Georgia, United States
4. Queens Heart Institute, Rosedale, NY, United States
5. Department of Internal Medicine (Cardiology), University of Tennessee Health Sciences Center, Memphis, Tennessee, United States