1. Department of Radiobiology, Cancer Research Institute, Biomedical Center, Slovak Academy of Sciences, Bratislava, Slovakia
2. Department of Physics and Instituto de Física Aplicada (INFAP), Universidad Nacional de San Luis, Consejo Nacional de Investigaciones Científicas y Técnicas, Ejército de los Andes 950, 5700 San Luis, Argentina
3. Laboratory of Radiobiology, General Physics Institute, Russian Academy of Sciences, Moscow, Russia