Gastrointestinal Neoplasms

• California Cancer Registry — Sacramento, California, United States
• University of Colorado Cancer Center — Aurora, Colorado, United States
• Colorado Central Cancer Registry — Denver, Colorado, United States
• Cancer Data Registry of Idaho — Boise, Idaho, United States

• Radboud University Medical Centre Nijmegen — Nijmegen, Gelderland, Netherlands

• Krankenhaus Nordwest — Frankfurt, Germany

• Queen Mary University of London — London, United Kingdom

Not specified

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

• Bakersfield, California, United States
• Colorado Springs, Colorado, United States
• Washington D.C., District of Columbia, United States
• Terre Haute, Indiana, United States

• University of Cancer Institute — Pittsburgh, Pennsylvania, United States

Not specified

• Research Site — Brussels, Belgium
• Research Site — Edegem, Belgium
• Research Site — Ghent, Belgium
• Research Site — Leuven, Belgium