[1] Emory Univ, Sch Med, Dept Med, Div Digest Dis, Atlanta, GA USA
[2] Beth Israel Deaconess Med Ctr, Div Gastroenterol, Boston, MA 02215 USA
[3] Harvard Med Sch, Boston, MA 02115 USA
[4] Harvard Med Sch, Brigham & Womens Hosp, Div Gastroenterol Hepatol & Endoscopy, Boston, MA 02115 USA
[5] Univ Calif San Diego, Dept Med, Div Gastroenterol, San Diego, CA 92103 USA
[6] Univ Utah, Div Gastroenterol & Hepatol, Sch Med, Salt Lake City, UT USA
[7] Cleveland Clin, Dept Gastroenterol Hepatol & Nutr, Cleveland, OH 44106 USA
[8] Houston Methodist Hosp, Underwood Ctr Digest Disorders, Div Gastroenterol, Houston, TX 77030 USA
[9] Univ N Carolina, Dept Med, Div Gastroenterol & Hepatol, Chapel Hill, NC 27599 USA
[10] Thomas Jefferson Univ, Div Gastroenterol & Hepatol, Philadelphia, PA 19107 USA
[11] Boston Univ, Sch Med, Dept Med, Div Gastroenterol,VA Boston Healthcare Syst, Boston, MA 02118 USA
[12] Mayo Clin Arizona, Dept Gastroenterol Hepatol & Nutr, Scottsdale, AZ USA
[13] St Louis Univ, Sch Med, St Louis, MO USA
[14] NYU, Div Gastroenterol, Grossman Sch Med, New York, NY USA
[15] Univ Colorado Denver, Div Gastroenterol, Aurora, CO USA