[1] Imelda GI Clin Res Ctr, B-2820 Bonheiden, Belgium
[2] Univ Alberta, Edmonton, AB T6G 2M7, Canada
[3] Hop St Louis, Paris, France
[4] Robarts Clin Trials Ctr, London, ON, Canada
[5] Univ Melbourne, St Vincents Hosp, Melbourne, Vic 3010, Australia
[6] Hop St Antoine, F-75571 Paris, France
[7] Katholieke Univ Leuven, Louvain, Belgium
[8] Lariboisiere Hosp, Paris, France
[9] Radcliffe Infirm, Oxford OX2 6HE, England
[10] Univ Regensburg, Regensburg, Germany
[11] Univ Chicago Hosp, Chicago, IL 60637 USA
[12] Mayo Clin, Rochester, MN USA