¹Division of Gastroenterology, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, USA

Correspondence: Joseph D. Feuerstein, MD, Division of Gastroenterology, Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, 110 Francis Street 8E Gastroenterology, Boston, Massachusetts 02215, USA. E-mail: jfeuerst@bidmc.harvard.edu

The author declares no conflict of interest.