1. Massachusetts General Hospital and Harvard Medical School Boston Massachusetts
2. Emory University School of Medicine Atlanta Georgia
3. University of British Columbia Vancouver British Columbia Canada
4. IRCCS San Raffaele Scientific Institute Vita‐Salute San Raffaele University Milan Italy
5. John Radcliffe Hospital Oxford UK
6. La Timone University Hospital Marseille
7. University of Verona Verona Italy
8. Ohio State University Wexner Medical Center Columbus
9. Hacettepe University Faculty of Medicine Ankara Turkey
10. Shinshu University Matsumoto Japan
11. Kanazawa University Graduate School of Medicine Kanazawa Japan
12. University of Ulsan College of Medicine Asan Medical Center Seoul South Korea
13. University of Toyama Toyama Japan
14. Kansai Medical University Osaka Japan
15. Mayo Clinic Rochester Minnesota
16. Nagaoka Red Cross Hospital Nagaoka Japan
17. Aix‐Marseille Université Assistance Publique Hôpitaux de Marseille Marseille France
18. Hayashi General Hospital Fukui Japan
19. University College London Hospitals London UK
20. Peking Union Medical College Hospital Chinese Academy of Medical Sciences Beijing China