1. Ronald Reagan‐UCLA Medical Center, Los Angeles, CA
2. Ochsner Heart and Vascular Institute, New Orleans, LA
3. Duke Clinical Research Institute, Durham, NC
4. Brigham and Women's Hospital and Harvard Medical School, Boston, MA
5. VA Palo Alto Health Care System, 3801 Miranda Ave., Palo Alto, CA
6. Northwestern University Feinberg School of Medicine, Chicago, IL