Digestive System Neoplasms

• Veterans Affairs Medical Center - Birmingham — Birmingham, Alabama, United States
• MBCCOP - Gulf Coast — Mobile, Alabama, United States
• CCOP - Greater Phoenix — Phoenix, Arizona, United States
• Veterans Affairs Medical Center - Phoenix (Hayden) — Phoenix, Arizona, United States

• Research Center in Gastroenterogy and Hepatology — Craiova, Dolj, Romania
• University Military Hospital — Bucharest, Romania
• Gastroenterology Department, Clinical Hospital Colentina — Bucharest, Romania
• Fundeni Clinical Institute — Bucharest, Romania

• Gastroenterology Department, Clinical Hospital Colentina — Bucharest, Romania

• The Ohio State University Comprehensive Cancer Center — Columbus, Ohio, United States

• National Cancer Center — Goyang-si, Gyeonggi-do, South Korea

• Abramson Cancer Center of the University of Pennsylvania — Philadelphia, Pennsylvania, United States

• Tenwek Hospital — Bornet, Kenya

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

Not specified

• Instituto Nacional del Cáncer — Santiago, RM, Chile