[1] Janssen Res & Dev, Spring House, PA USA
[2] Ctr Hosp Univ Lille, Lille, France
[3] Univ Klin Innere Med IV, Vienna, Austria
[4] Robarts Res Inst, London, ON N6A 5C1, Canada
[5] Univ Hosp Gasthuisberg, B-3000 Louvain, Belgium
[6] Univ Calif San Diego, La Jolla, CA 92093 USA