1. Department of Gastroenterology, Scripps Clinic, La Jolla, CA, USA
2. Department of Gastroenterology, University of Maryland School of Medicine and Greenebaum Cancer Center, Baltimore, MD, USA
3. Department of Gastroenterology, Cleveland Clinic, Cleveland, OH, USA
4. Department of Gastroenterology, North Shore LIJ Health System and ProHEALTHcare Associates, Syosset and Lake Success, Nassau County, NY, USA
5. Department of Gastroenterology, School of Medicine, University of North Carolina, Chapel Hill, NC, USA
6. Department of Gastroenterology, Alpert School of Medicine of Brown University, Providence, RI, USA