[1] Univ Manitoba, Gastroenterol Sect, IBD Clin & Res Ctr, Winnipeg, MB, Canada
[2] Chinese Univ Hong Kong, Dept Internal Med, Inst Digest Dis, Hong Kong, Hong Kong, Peoples R China
[3] Semmelweis Univ, Dept Med 1, H-1085 Budapest, Hungary
[4] Oslo Univ Hosp, Dept Gastroenterol, Oslo, Norway
[5] Univ Oslo, Oslo, Norway
[6] Mayo Clin, Div Gastroenterol & Hepatol, Rochester, MN USA