[1] Skane Univ Hosp, Lund, Sweden
[2] Sarcoma Oncol Ctr, Santa Monica, CA USA
[3] Royal Orthopaed Hosp, Birmingham B31 2AP, W Midlands, England
[4] Sir Charles Gairdner Hosp, Nedlands, WA 6009, Australia
[5] Univ Michigan, Ann Arbor, MI 48109 USA
[6] Univ Minnesota, Masonic Canc Ctr, Minneapolis, MN USA
[7] Univ Penn, Sch Med, Philadelphia, PA 19104 USA
[8] Amgen Inc, Thousand Oaks, CA 91320 USA