[1] Univ British Columbia, Vancouver, BC V5Z 1M9, Canada
[2] Monash Univ, Clayton, Vic, Australia
[3] British Columbia Canc Agcy, Vancouver, BC V5Z 4E6, Canada
[4] Vancouver Gen Hosp, Vancouver, BC, Canada
[5] Univ So Calif, Los Angeles, CA USA
[6] AGO Study Grp, Marburg, Germany
[7] Inst Pathol, Mannheim, Germany
[8] Univ Tubingen Hosp, Tubingen, Germany