[1] EORTC Data Ctr, Brussels, Belgium
[2] Natl Canc Inst, Cairo, Egypt
[3] Klinikum Stadt Mannheim, Mannheim, Germany
[4] Antoni Van Leeuwenhoek Hosp, Netherlands Canc Inst, Amsterdam, Netherlands
[5] London Reg Canc Ctr, London, ON N6A 4L6, Canada
[6] Free Univ Med Ctr, Amsterdam, Netherlands
[7] State Univ Ghent, B-9000 Ghent, Belgium