[1] Kantonsspital Aarau, Radiat Oncol, Aarau, Switzerland
[2] SAKK Coordinating Ctr, Bern, Switzerland
[3] Univ Hosp Zurich, Med Oncol, Zurich, Switzerland
[4] Sanjay Gandhi Inst, Radiotherapy, Lucknow, Uttar Pradesh, India
[5] Univ Hosp Zurich, Radiat Oncol, Zurich, Switzerland