[1] Univ Hosp Geneva, Geneva, Switzerland
[2] CHU Strasbourg, F-67000 Strasbourg, France
[3] F Hoffmann La Roche & Co Ltd, CH-4002 Basel, Switzerland
[4] McMaster Univ, Hamilton, ON, Canada
[5] St Josephs Hosp, Hamilton, ON, Canada
[6] Univ Cologne, D-50931 Cologne, Germany
[7] Hosp Angeles Mocel, Mexico City, DF, Mexico
[8] Hosp Univ Marques de Valdecilla, Santander, Spain
[9] Genentech Inc, San Francisco, CA 94080 USA
[10] Univ Modena & Reggio Emilia, Modena, Italy
[11] Univ Leeds, Leeds, W Yorkshire, England