[1] Aarhus Univ Hosp, Danish Ctr Particle Therapy, Aarhus, Denmark
[2] Aarhus Univ, Dept Clin Med, Aarhus, Denmark
[3] Natl Ctr Oncol Hadrontherapy CNAO, Radiat Oncol Unit, Clin Dept, Pavia, Italy
[4] Univ Pavia, Dept Internal Med & Med Therapy, Pavia, Italy
[5] Greater Poland Canc Ctr Poznan, Dept Radiotherapy, Poznan, Poland
[6] Univ Med Sci, Poznan, Poland
[7] Univ Coll London Hosp, Dept Oncol, London, England
[8] Inst Oncol, Dept Radiotherapy, Ljubljana, Slovenia
[9] Maria Sklodowska Curie Natl Res Inst Oncol, Gliwice Branch, Brachytherapy Dept, Gliwice, Poland
[10] North Estonia Med Ctr Fdn, Radiotherapy Ctr, Tallinn, Estonia
[11] Med Univ Vienna, Dept Radiat Oncol, Ctr Comprehens Canc, Vienna, Austria