[1] Canc Ctr SE Ontario, Kingston, ON, Canada
[2] Princess Margaret Hosp, Toronto, ON M4X 1K9, Canada
[3] Queen Elizabeth 2 Hlth Sci Ctr, Halifax, NS, Canada
[4] British Columbia Canc Ctr So Interior, Kelowna, BC, Canada
[5] Fraser Valley Ctr, British Columbia Canc Ctr, Surrey, BC, Canada
[6] NCIC Clin Trials Grp, Kingston, ON, Canada
[7] NCI, Therapy Evaluat Program, Bethesda, MD 20892 USA