[1] Hosp La Fe, Radiat Oncol, Valencia, Spain
[2] Hosp Clin Benidorm, Radiat Oncol, Alicante, Spain
[3] Univ Valencia, Dept Atom Mol & Nucl Phys, Valencia, Spain
[4] Linkoping Univ Sweden, Dept Med & Hlth IMH, Radiat Phys, Linkoping, Sweden
[5] Univ Wisconsin Madison, Dept Med Phys, Sch Med & Publ Hlth, Madison, WI USA
[6] Natl & Kapodistrian Univ Athens, Sch Med, Med Phys Lab, Athens, Greece
[7] Brown Univ, Dept Radiat Oncol, Alpert Med Sch, Providence, RI USA
[8] UKSH, Klin Strahlentherapie Radioonkol, Campus Kiel, Kiel, Germany