Digestive System Neoplasms

• Alabama Hematology/Oncology — Birmingham, Alabama, United States
• Palo Verde Hematology & Oncology — Glendale, Arizona, United States
• Arizona Cancer Center — Tucson, Arizona, United States
• Northeast Arkansas Clinic — Jonesboro, Arkansas, United States

• University of Alabama at Birmingham — Birmingham, Alabama, United States
• Mayo Clinic, Scottsdale, Arizona — Scottsdale, Arizona, United States
• California Cancer Associates for Research and Excellence - Encinitas — Encinitas, California, United States
• University of California San Diego - Moores Cancer Center — La Jolla, California, United States

Not specified

• Mayo Clinic Scottsdale — Scottsdale, Arizona, United States
• Mayo Clinic Cancer Center — Rochester, Minnesota, United States

Not specified

Not specified

• Vejle Hospital — Vejle, Denmark

• Universitair Ziekenhuis Antwerpen (UZA), Division of Gastroenterology and Hepatology — Edegem, Belgium
• Universitätsklinik für Allgemeine, Viszeral- und Transplantationschirurgie — Tübingen, Germany
• Istituto Nazionale Tumori "Pascale" (INTNA) — Naples, Italy
• Ospedale Sacro Cuore-Don Calabria U.O.C. Oncologica Medica — Negrar, Italy

• University of Cologne, Department of General, Visceral and Cancer Surgery — Cologne, Germany

• The Churchill Hospital, Oxford Radcliffe Hospitals NHS trust — Oxford, Oxfordshire, United Kingdom