1. Department of Gastroenterology and Hepatology, Veterans Affairs Medical Center, Kansas City, MO, USA
2. Department of Gastroenterology and Hepatology, Indiana University School of Medicine, Indianapolis, IN, USA
3. Instituto Português de Oncologia do Porto, Porto, Portugal
4. Saint Luke’s Health Systems, Kansas City, MO, USA
5. Department of Gastroenterology and Hepatology, The University of Kansas School of Medicine, Kansas City, KS, USA