1. Cleveland ClinicCleveland Ohio
2. University of South FloridaTampa
3. Mayo ClinicRochester Minnesota
4. St. Joseph's Hospital, McMaster UniversityHamilton Ontario Canada
5. Boston UniversityBoston Massachusetts
6. Mount Sinai HospitalToronto Ontario Canada
7. Johns Hopkins UniversityBaltimore Maryland
8. University of PittsburghPittsburgh Pennsylvania
9. Cedars–Sinai Medical CenterLos Angeles California
10. University of UtahSalt Lake City
11. University of PennsylvaniaPhiladelphia
12. Hospital for Special SurgeryNew York New York