| Center of Excellence in Esophageal Surgery, Sf. Maria Clinical Hospital, Bucharest, Romania - TigerStudy - ECRF |
| Central University Hospital of Asturias, Oviedo, Spain - TigerStudy - ECRF |
| Clinic for Digestive surgery - First Surgical Clinic, Clinical Center of Serbia, Belgrade, Serbia - TigerStudy - ECRF |
| Department of Upper GI Surgery, University Hospitals Birmingham NHS Foundation Trust, Birmingham, United Kingdom - TigerStudy - ECRF |
| Klinik für Viszeral und Transplantationschirurgie, Zürich, Switzerland - TigerStudy - ECRF |
| The Cancer Institute Hospital Of JFCR, Tokyo, Japan - Tiger Study - ECRF |
