1. Dana-Farber Cancer Institute and Brigham and Women's Hospital, Harvard Medical School; Boston Massachusetts USA
2. Jagiellonian University Medical College; Krakow Poland
3. Masaryk University; Brno Czech Republic
4. Professor Edgar Santos University Hospital; Salvador Brazil
5. University Hospital of Salamanca; Salamanca Spain
6. Mayo Clinic; Rochester Minnesota USA
7. Nantes University Hospital; Nantes France
8. Washington University School of Medicine; Saint Louis Missouri USA
9. Le Scotte Hospital; Siena Italy
10. University of Ostrava and Faculty Hospital Ostrava; Ostrava Czech Republic
11. Santa Casa de Misericordia Hospital; Sao Paulo Brazil
12. Weill Cornell Medical College; New York New York USA
13. Charles University Hospital; Hradec Kralove Czech Republic
14. The University of Texas MD Anderson Cancer Center; Houston Texas USA
15. Karolinska University Hospital; Stockholm Sweden
16. Palacky University Hospital; Olomouc Czech Republic
17. University Hospital Brno; Brno Czech Republic
18. Rhode Island Hospital, Alpert Medical School of Brown University; Providence Rhode Island USA
19. Charles University Hospital; Prague Czech Republic
20. Warsaw Medical University; Warsaw Poland