1 1] Dartmouth-Hitchcock Medical Center, Section of Gastroenterology, Lebanon, New Hampshire, USA [2] Department of Medicine, Geisel School of Medicine at Dartmouth, Hanover, New Hampshire, USA.
2 1] Department of Medicine, Geisel School of Medicine at Dartmouth, Hanover, New Hampshire, USA [2] Department of Veterans Affairs Medical Center, White River Junction, Vermont, USA.
3 Department of Community and Family Medicine, Geisel School of Medicine at Dartmouth, Hanover, New Hampshire, USA.