[1] Natl Canc Inst, Canada Clin Trials Grp, Kingston, ON, Canada
[2] Canc Ctr SE Ontario, Kingston, ON, Canada
[3] Univ Toronto, Princess Margaret Hosp, Univ Hlth Newtork, Toronto, ON, Canada
[4] Univ Alberta Hosp, Edmonton, AB T6G 2B7, Canada
[5] British Columbia Canc Agcy, Fraser Valley Ctr, Surrey, BC, Canada
[6] Vanderbilt Ingram Canc Ctr, Nashville, TN USA
[7] Univ Washington, Seattle, WA 98195 USA