[1] Ohio State Univ, Wexner Med Ctr, Inflammatory Bowel Dis, Columbus, OH 43210 USA
[2] Fdn Policlin A Gemelli IRCCS Univ Cattolica, Gastroenterol, Rome, Italy
[3] INSERM, Paris, France
[4] Univ Paris, Gastroenterol, Paris, France
[5] Univ British Columbia, Gastroenterol, Vancouver, BC, Canada
[6] St Marks Hosp, Gastroenterol, London, England
[7] Univ Chicago, Gastroenterol Hepatol & Nutr, Chicago, IL 60637 USA
[8] Ctr Med Teknon, Gastroenterol, Barcelona, Spain
[9] Charite Univ Med Berlin, Gastroenterol Infectiol & Rheumatol, Berlin, Germany
[10] Digest Dis Associates, Gastroenterol, Gainesville, FL USA