[1] Massachusetts Gen Hosp, Ctr Canc, Boston, MA USA
[2] Harvard Univ, Sch Med, Boston, MA USA
[3] Vall dHebron Univ Hosp, Barcelona, Spain
[4] Seoul Natl Univ, Coll Med, Seoul, South Korea
[5] Roche Prod Ltd, Welwyn Garden City, Herts, England
[6] F Hoffmann La Roche & Co Ltd, CH-4002 Basel, Switzerland
[7] MedStar Washington Hosp Ctr, Washington, DC USA