[1] Antoni van Leeuwenhoek Hosp, Netherlands Canc Inst, Dept Radiat Oncol, Amsterdam, Netherlands
[2] Leiden Univ, Med Ctr, Leiden, Netherlands
[3] Comprehens Canc Ctr Netherlands, Rotterdam, Netherlands
[4] Inst Radiat Oncol Arnhem, Arnhem, Netherlands
[5] Maastricht Univ, Med Ctr, Dept Radiat Oncol, Maastro Clin, NL-6200 MD Maastricht, Netherlands
[6] Univ Med Ctr Groningen, Dept Radiat Oncol, NL-9713 AV Groningen, Netherlands
[7] Verbeeten Inst, Dept Radiat Oncol, Tilburg, Netherlands
[8] Radiotherapy Inst Friesland, Dept Radiat Oncol, Leeuwarden, Netherlands
[9] Radiotherapeut Inst Stedendriehoek & Omstreken Ri, Dept Radiat Oncol, Deventer, Netherlands
[10] Leiden Univ, Med Ctr, Dept Radiat Oncol, Leiden, Netherlands
[11] Radboud Univ Nijmegen, Med Ctr, Dept Radiat Oncol, NL-6525 ED Nijmegen, Netherlands
[12] Catharina Hosp, Dept Radiat Oncol, Eindhoven, Netherlands
[13] Med Ctr Haaglanden, Dept Radiat Oncol, The Hague, Netherlands
[14] Univ Med Ctr Utrecht, Dept Radiotherapy, Utrecht, Netherlands
[15] Med Ctr Alkmaar, Dept Radiat Oncol, Alkmaar, Netherlands
[16] Med Spectrum Twente, Dept Radiat Oncol, Enschede, Netherlands