Digestive System Neoplasms

• University Medical Center Göttingen — Göttingen, Germany
• HELIOS St. Marienberg Hospital Helmstedt — Helmstedt, Germany
• Helios Albert-Schweitzer-Hospital, Academic University Teaching Hospital — Northeim, Germany
• HELIOS Medical Center Siegburg, Department of Gastroenterology — Siegburg, Germany

Not specified

• University of Texas MD Anderson Cancer Center — Houston, Texas, United States

Not specified

• Fairfax Family Practice Centers — Fairfax, Virginia, United States
• Virginia Ambulatory Care Outcomes Research Network — Richmond, Virginia, United States

• María Pellisé. MD. PhD. — Barcelona, Spain

• University of California San Francisco — San Francisco, California, United States

• Clinique PARIS-BERCY — Charenton-le-Pont, France

• Copenhagen University Hospital Herlev — Herlev, Denmark
• Research Center of Gastroenterology and Hepatology, — Craiva, Romania

• Fondazione IRCCS Istituto Nazionale dei Tumori di Milano — Milan, MI, Italy