[1] Mayo Clin, Dept Gastroenterol & Hepatol, Scottsdale, AZ 85259 USA
[2] Harvard Med Sch, Dept Internal Med, Div Gastroenterol, Boston, MA 02115 USA
[3] Massachusetts Gen Hosp, Boston, MA 02114 USA
[4] Rush Univ, Med Ctr, Dept Internal Med, Div Digest Dis, Chicago, IL 60612 USA
[5] Tulane Univ, Hlth Sci Ctr, Sect Gastroenterol & Hepatol, New Orleans, LA 70118 USA
[6] Univ Michigan, Michigan Med, Dept Gastroenterol, Ann Arbor, MI 48109 USA
[7] Univ Colorado, Sch Med, Div Gastroenterol & Hepatol, Aurora, CO USA
[8] Univ Minnesota, Dept Gastroenterol Hepatol & Nutr, Minneapolis, MN USA
[9] Long Isl Jewish Med Ctr, Zucker Sch Med Hofstra Northwell, Dept Gastroenterol, New Hyde Pk, NY 11042 USA
[10] Calif Pacific Med Ctr, Intervent Endoscopy Serv, Dept Gastroenterol, San Francisco, CA USA
[11] Univ Oklahoma, Hlth Sci Ctr, Div Digest Dis & Nutr, Oklahoma City, OK USA
[12] Boston Univ, Sch Med, Boston Med Ctr, Div Gastroenterol, Boston, MA 02118 USA