Author(s):
1. Kremena Ivanova, National Centre of Radiobiology and Radiation Protection, Sofia, Bulgaria, Bulgaria
2. Todor Yordanova, National Centre of Radiobiology and Radiation Protection, Sofia, Bulgaria, Bulgaria
3. Desislava Djuvnakova, National Centre of Radiobiology and Radiation Protection, Bulgaria
4. Zdenka Stojanovska, Faculty of Medical Sciences, Goce Delčev University Stip, Macedonia