1. Columbia University Medical Center, New York, NY
2. Duke Clinical Research Institute, Durham, NC
3. Brigham and Women's Hospital Heart & Vascular Center and Harvard Medical School, Boston, MA
4. David Geffen School of Medicine, University of California at Los Angeles, CA
5. Michigan State University, East Lansing, MI
6. Massachusetts General Hospital, Boston, MA
7. Hotchkiss Brain Institute, University of Calgary, Alberta, Canada