1. Department of Internal Medicine UT Southwestern Medical Center Dallas TX USA
2. Division of Cardiology, Department of Internal Medicine UT Southwestern Medical Center Dallas TX USA
3. Division of Cardiology Texas Heart Institute Houston TX USA
4. Department of Cardiology Houston Methodist DeBakey Heart & Vascular Center Houston TX USA
5. Palo Alto Medical Foundation – Sutter Health Palo Alto CA USA
6. Duke Clinical Research Institute Durham NC USA