[1] Christie Hosp NHS Trust, Dept Clin Oncol, Manchester M20 4BX, Lancs, England
[2] Centrum Onkol Inst M Curie, Dept Radiotherapy, Gliwice, Poland
[3] Univ Nijmegen, Med Ctr, Dept Radiat Oncol, Nijmegen, Netherlands
[4] Dokuz Eylul Univ, Dept Radiat Oncol, Tip Fak, Izmir, Turkey
[5] ESTRO Off, Brussels, Belgium