1. Indiana University School of Medicine Indianapolis Indiana USA
2. The University of Chicago Chicago Illinois USA
3. NorthShore University HealthSystem Evanston Illinois USA
4. Johns Hopkins University School of Medicine Baltimore Maryland USA
5. University of Florida College of Medicine Jacksonville Jacksonville Florida USA
6. Michigan Medicine and University of Michigan Ann Arbor Michigan USA
7. Cleveland Clinic Cleveland Ohio USA
8. Brigham and Women's Hospital/Harvard Medical School Boston Massachusetts USA