Gastrointestinal Neoplasms

• Agios Georgios Chania General Hospital — Chania, Mournies, Greece
• 2nd Dept of Internal Medicine, Agios Savvas Cancer Hospital — Athens, Greece
• 251 Airforce Hospital — Athens, Greece
• 2nd Dept of Internal Medicine, General Hospital of Athens "Hippokratio" — Athens, Greece

• Cancer Institute and Hospital, Chinese Academy of Medical Science — Beijing, Beijing Municipality, China

• Fayetteville, Arkansas, United States
• Boston, Massachusetts, United States
• Ann Arbor, Michigan, United States
• Hackensack, New Jersey, United States

• St James's Hospital — Dublin, Ireland

Not specified

• Kaiser Permanente Washinton Health Research Institute — Seattle, Washington, United States

• Memorial Sloan-Kettering Cancer Center (MSKCC) MSKCC (3) — New York, United States
• Medical University of South Carolina Oncology Dept — Charleston, South Carolina, United States
• University of Texas/MD Anderson Cancer Center Onc. Dept, — Houston, Texas, United States
• University of Wisconsin / Paul P. Carbone Comp Cancer Center Univ Wisc — Madison, Wisconsin, United States

• Washington University School of Medicine — St Louis, Missouri, United States

• Santa Clara Valley Medical Center — San Jose, California, United States

• Johns Hopkins University/Sidney Kimmel Cancer Center — Baltimore, Maryland, United States
• University of Puerto Rico — San Juan, Puerto Rico