[1] Mount Vernon Canc Ctr, Northwood HA6 2RN, Middx, England
[2] Toronto Sunnybrook Canc Ctr, Toronto, ON, Canada
[3] Radiotherapy Inst Friesland, Leeuwarden, Netherlands
[4] EORTC Qual Life Unit, Brussels, Belgium
[5] St James Hosp, Canc Res UK Ctr, Leeds LS9 7TF, W Yorkshire, England