1. Duke University Medical Center, Durham, NC, USA
2. University of California, Los Angeles, USA
3. University of Arkansas for Medical Sciences, Little Rock, AR, USA
4. Reach Institute, New York, NY, USA
5. University of North Carolina at Chapel Hill, USA
6. University of Pittsburgh, PA, USA
7. Ohio State University, Columbus, USA
8. McGill University Health Centre, Montreal, Quebec, Canada
9. University of California, Irvine, USA
10. University of California, Berkeley, USA
11. University of California, San Francisco, USA