[1] Univ Hosp Leuven, Dept Radiat Oncol, Leuven, Belgium
[2] Univ Laval, Fac Sci & Engn, Quebec City, PQ, Canada
[3] IAEA, Div Human Hlth, Vienna, Austria
[4] Ctr Antoine Lacassagne, Dept Med Phys, Nice, France
[5] Calvary Mater Newcastle, Sch Hlth Sci, Newcastle, NSW, Australia
[6] Clatterbridge Canc Ctr, Dept Med Phys, Liverpool, Merseyside, England
[7] Imperial Coll Healthcare NHS Trust, Dept Radiat Oncol, London, England
[8] Brown Univ, Dept Med Phys, Alpert Med Sch, Providence, RI 02912 USA
[9] La Fe Hosp, Dept Radiotherapy, Valencia, Spain
[10] Alfred Hosp, Dept Radiat Oncol, Melbourne, Vic, Australia
[11] Catharina Hosp, Dept Radiat Oncol, Eindhoven, Netherlands
[12] Univ Hosp Augsburg, Dept Radiat Oncol, Augsburg, Germany
[13] Northern Ireland Canc Ctr, Dept Radiat Oncol, Belfast, Antrim, North Ireland
[14] Univ Hosp Galway, Med Phys & Bioengn, Galway, Ireland
[15] UKSH, Clin Radiotherapy Campus Kiel, Kiel, Germany