Gastrointestinal Neoplasms

• Norwalk Hospital — Norwalk, Connecticut, United States
• Tunnell Cancer Center at Beebe Medical Center — Lewes, Delaware, United States
• CCOP - Christiana Care Health Services — Newark, Delaware, United States
• Lombardi Comprehensive Cancer Center at Georgetown University Medical Center — Washington D.C., District of Columbia, United States

• Registre du Cancer — Poitiers, France

• The First Affiliated Hospital of Harbin Medical University — Harbin, Heilongjiang, China

• Wake Forest Cancer Center CCOP Research Base — Winston-Salem, North Carolina, United States

• W F Baptist Health — Winston-Salem, North Carolina, United States

• Meander medical center — Amersfoort, Netherlands
• Tergooi hospital — Hilversum, Netherlands
• St Antonius Hospital — Nieuwegein, Netherlands
• Rivierenland ziekenhuis — Tiel, Netherlands

• Hospital Clinico San Carlos — Madrid, Spain
• Alejandra Garcia Botella — Madrid, Spain

Not specified

• Cookridge Hospital — Leeds, England, United Kingdom
• Clinical Trials and Research Unit of the University of Leeds — Leeds, England, United Kingdom
• Medical Research Council Clinical Trials Unit — London, England, United Kingdom
• Velindre Cancer Center at Velindre Hospital — Cardiff, Wales, United Kingdom

• Geisinger — Danville, Pennsylvania, United States