1. Service of Radiation Physics and Radiation Protection Clínica Universidad de Navarra Avda. Pío XII 31008Pamplona Navarra Spain
2. Department of Physics and Applied Mathematics, School of Sciences Universidad de Navarra. C/ Irunlarrea 31008Pamplona Navarra Spain
3. Service of Radiation Oncology Clínica Universidad de Navarra Avda. Pío XII 31008Pamplona Navarra Spain