[1] Cedars Sinai Med Ctr, Los Angeles, CA 90048 USA
[2] Alamo Med Res, San Antonio, TX USA
[3] Univ Penn, Div Gastroenterol, Philadelphia, PA 19104 USA
[4] Beth Israel Deaconess Med Ctr, Boston, MA 02215 USA
[5] Univ Paris, Henri Mondor Hosp, APHP, F-75252 Paris, France
[6] JW Goethe Univ Hosp, Frankfurt, Germany
[7] Univ Calgary, Calgary, AB, Canada
[8] Hosp U Puerta de Hierro, Madrid, Spain
[9] Columbia Univ Coll Phys & Surg, New York Presbyterian Hosp, New York, NY 10032 USA
[10] Univ Palermo, Palermo, Italy
[11] Hannover Med Sch, D-3000 Hannover, Germany
[12] Merck Sharp & Dohme Corp, Whitehouse Stn, NJ USA
[13] Johns Hopkins Univ, Sch Med, Baltimore, MD USA