1. UC San Diego Health, San Diego, California
2. Methodist Hospital Indiana University, Indianapolis, Indiana
3. University of North Carolina School of Medicine, Chapel Hill, North Carolina
4. Vanderbilt University Medical Center, Nashville, Tennessee
5. University of British Columbia, Vancouver, British Columbia, Canada
6. Ohio State University, Columbus, Ohio
7. Mayo Clinic, Scottsdale, Arizona
8. Columbia University Irving Medical Center, New York, New York