[1] British Columbia Canc Agcy, Dept Pathol & Lab Med, Vancouver, BC, Canada
[2] British Columbia Canc Agcy, Dept Med Biophys, Vancouver, BC, Canada
[3] Univ British Columbia, Expt Med Program, Vancouver, BC V5Z 1M9, Canada
[4] Univ British Columbia, Dept Pathol & Lab Med, Vancouver, BC V5Z 1M9, Canada