1. Central Laboratory of Radiation Safety and Dosimetry of Medical Exposure, Grigorev Institute for Medical Radiology and Oncology , 82 Pushkinska Street, Kharkiv 61024 , Ukraine
2. Department of Diagnostic Radiology, Dalhousie University , PO BOX 9000, 1276 South Park Street, Halifax, NS B3H 2Y9 , Canada
3. State Nuclear Regulatory Inspectorate of Ukraine , 9/11 Arselna Street, Kyiv 01001 , Ukraine
4. Radiation Protection of Patients Unit , International Atomic Energy Agency, , PO Box 100, Vienna 1400 , Austria
5. Vienna International Centre , International Atomic Energy Agency, , PO Box 100, Vienna 1400 , Austria