1. Radiation Practices Regulation, Radiotherapy and Nuclear Medicine; STUK-Radiation and Nuclear Safety Authority; Helsinki Finland
2. Department of Oncology; Unit of Radiotherapy, Tampere University Hospital; Tampere Finland
3. Department of Medical Physics; Medical Imaging Center, Tampere University Hospital; Tampere Finland
4. Radiation Practices Regulation, Radiation Metrology Laboratory and Occupational Exposure; STUK-Radiation and Nuclear Safety Authority; Helsinki Finland