1. Division of Surgery and Interventional Science; University College London; London United Kingdom
2. Department of Biomedical Sciences for Health, Division of General Surgery; University of Milan School of Medicine; Milano Italy
3. Department of Surgery; Mayo Clinic; Rochester Minnesota
4. Department of Surgery; VU University Medical Center; Amsterdam the Netherlands
5. Department of Pathology; University of Washington; Seattle Washington
6. Faculdade de Medicina da Universidade de São Paulo; São Paulo Brazil
7. Department of Surgery; VA Puget Sound and University of Washington; Seattle Washington
8. Royal Surrey County Hospital; Guildford United Kingdom
9. Academic Department of Surgery; Royal Marsden Hospital; London United Kingdom
10. Department of Surgery; University Medical Center Utrecht; Utrecht the Netherlands
11. N.N.Blokhin Russian Cancer Research Center; RAMS; Moscow Russia
12. Department of Oncology; Jersey Shore University Medical Center; Neptune New Jersey
13. Screening Group at WHO, International Agency for Research on Cancer; Lyon France
14. Institute of Pathology; University of Bern; Bern Switzerland
15. Department of General Surgery; Norfolk and Norwich University Hospital; Norwich United Kingdom
16. Department of Cardiothoracic Surgery; University of Pittsburgh; Pittsburgh Pennsylvania