1. Houston Methodist DeBakey Heart and Vascular Center and Research Institute, Houston, Texas
2. Arizona Heart Rhythm Center, Phoenix
3. Michael E. DeBakey Veterans Affairs Medical Center, Houston, Texas
4. Keck-USC University Hospital, University of Southern California, Los Angeles
5. Emory St Joseph’s Hospital, Emory University, Atlanta, Georgia
6. Sharp Memorial Hospital, San Diego, California
7. Virginia Commonwealth University School of Medicine, Richmond
8. Texas Cardiac Arrhythmia Institute, St David’s Medical Center, Austin
9. Libin Cardiovascular Institute, University of Calgary, Calgary, Alberta, Canada