[1] Med Spectrum Twente, Dept Radiat Oncol, Haaksbergerstr 55, NL-7513 ER Enschede, Netherlands
[2] Lab Pathol Oost Nederland, NL-7512 ER Enschede, Netherlands
[3] Catharina Hosp, Dept Radiat Oncol, Eindhoven, Netherlands
[4] Leiden Univ, Med Ctr, Dept Clin Oncol, NL-2333 ZA Leiden, Netherlands
[5] Arnhem Radiotherapeut Inst, Arnhem, Netherlands
[6] Univ Twente, Fac Behav Sci, Dept Res Methodol Measurement & Data Anal, NL-7500 AE Enschede, Netherlands
[7] Med Spectrum Twente, Dept Clin Epidemiol, NL-7513 ER Enschede, Netherlands
[8] Radiotherapy Inst Steden Omstreken, Deventer, Netherlands
[9] Radiotherapy Inst Friesland, Leeuwarden, Netherlands
[10] Med Spectrum Twente, Dept Obstet & Gynaecol, NL-7513 ER Enschede, Netherlands
[11] Comprehens Canc Ctr North East, Enschede, Netherlands