[1] London Clin Trials Res Grp, London, England
[2] Mayo Clin, Rochester, MN USA
[3] Univ Toronto, Toronto, ON, Canada
[4] Univ Virginia, Charlottesville, VA USA
[5] Univ Calgary, Calgary, AB, Canada
[6] Univ Alabama, Birmingham, AL USA
[7] Atlanta Gastroenterol Assoc, Atlanta, GA USA
[8] Univ Montreal, Montreal, PQ, Canada
[9] Univ Manitoba, Winnipeg, MB, Canada
[10] Univ Penn, Philadelphia, PA 19104 USA
[11] Celltech Therapeut Inc, Slough, Berks, England
[12] Univ Chicago Hosp, Chicago, IL 60637 USA