[1] Univ Kentucky, Med Ctr, Div Digest Dis & Nutr, Lexington, KY USA
[2] NCI, Pathol Lab, Bethesda, MD 20892 USA
[3] Univ Copenhagen, Dept Gastroenterol, Hvidovre Hosp, Copenhagen, Denmark
[4] Univ Copenhagen, Fac Hlth Sci, Copenhagen, Denmark
[5] Univ Western Australia, Sch Med & Pharmacol, Perth, WA 6009, Australia
[6] Natl Univ Hosp Reykjavik, Sect Gastroenterol & Hepatol, Reykjavik, Iceland
[7] Mahidol Univ, Fac Med, Siriraj Hosp, Bangkok 10700, Thailand
[8] Gartnavel Royal Hosp, Glasgow, Lanark, Scotland
[9] Mayo Clin, Div Gastroenterol & Hepatol, Rochester, MN USA