[1] Haaglanden Med Ctr, Dept Radiat Oncol, Leidschendam, Netherlands
[2] Univ Otago, Dept Radiat Therapy, Wellington, New Zealand
[3] Bowen Icon Canc Ctr, Wellington, New Zealand
[4] Aarhus Univ, Dept Clin Med, Aarhus, Denmark
[5] Aarhus Univ Hosp, Dept Oncol, Aarhus, Denmark
[6] Aarhus Univ Hosp, Danish Ctr Particle Therapy, Aarhus, Denmark
[7] Princess Margaret Canc Ctr, Radiat Med Program, Toronto, ON, Canada
[8] Univ Toronto, Dept Radiat Oncol, Toronto, ON, Canada
[9] Sheffield Hallam Univ, Sheffield, England
[10] Paracelsus Med Univ Clin, Dept Radiotherapy & Radiooncol, LKH Salzburg, Salzburg, Austria