1. Dartmouth-Hitchcock Medical Center; Lebanon; NH; USA
2. University of Newcastle; Callaghan; New South Wales; Australia
3. Mayo Clinic; Rochester; MN; USA
4. Mayo Clinic; Jacksonville; FL; USA
5. Mayo Clinic; Scottsdale; AZ; USA
6. Baylor College of Medicine; Houston; TX; USA
7. Northwestern University; Chicago; IL; USA
8. McMaster University Medical Center; Hamilton; Ontario; Canada
9. St. Louis University; St. Louis; MO; USA