[1] Hannover Med Sch, D-30623 Hannover, Germany
[2] USC Keck Sch Med, Los Angeles, CA USA
[3] Henry Ford Hosp, Detroit, MI USA
[4] Scripps Clin, La Jolla, CA USA
[5] Univ Klinikum, Dusseldorf, Germany
[6] Evgenidion Hosp, Athens, Greece
[7] Univ Iowa, Iowa City, IA USA
[8] Cornell Univ, Weill Med Coll, New York, NY 10021 USA
[9] Hosp Ramon & Cajal, E-28034 Madrid, Spain
[10] Univ Miami, Miami, FL USA
[11] Univ Pittsburgh, Pittsburgh, PA USA
[12] St Louis Univ, St Louis, MO 63103 USA
[13] Hop Beaujon, Clichy, France
[14] Minnesota Clin Res Ctr, Plymouth, MN USA
[15] Duke Univ, Durham, NC USA
[16] Schering Plough Res Inst, Kenilworth, NJ USA