[1] NCIC, Brain Grp, EORTC, Kingston, ON, Canada
[2] NCIC, Radiotherapy Grp, EORTC, Kingston, ON, Canada
[3] NCIC, Clin Trials Grp, Kingston, ON, Canada
[4] Eortc Data Ctr, Brussels, Belgium
[5] CHU Vaudois, CH-1011 Lausanne, Switzerland
[6] Erasmus Univ, Med Ctr, Rotterdam, Netherlands
[7] CHUM, Hop Notre Dame, Montreal, PQ, Canada