1. Greenville Health System, Greenville, SC, USA
2. Massachusetts General Hospital, Boston, MA, USA
3. Montefiore Medical Center, New York, NY, USA
4. North Central Heart, Sioux Falls, SD, USA
5. University Hospitals, Cleveland, OH, USA
6. Brigham and Women’s Hospital, Boston, MA, USA
7. Mount Sinai Medical Center, New York, NY, USA
8. Munroe Regional Medical Center, Ocala, FL, USA
9. VA Boston Healthcare System, Boston, MA, USA