1. Brigham and Women’s Hospital and Harvard Medical School, Boston, USA
2. University of California San Francisco School of Medicine, San Francisco, USA
3. Northwestern University School of Medicine, Chicago, USA
4. Duke University School of Medicine, Durham, USA
5. University of North Carolina School of Medicine, Chapel Hill, USA
6. Virginia Commonwealth University School of Medicine, Richmond, USA
7. Tufts Medical Center, Boston, Massachusetts, USA
8. Cooper University Hospital, Camden, New Jersey, USA