1. Department of Medical and Clinical Biophysics, Faculty of Medicine, University of P. J. Šafárik in Košice, Trieda SNP 1, Košice, 040 11, Slovakia
2. 1st Department of Stomatology, Faculty of Medicine, University of P. J. Šafárik in Košice, Trieda SNP 1, Košice, 040 11, Slovakia
3. Department of Stomatology and Maxillofacial Surgery, Faculty of Medicine, University of P. J. Šafárik in Košice, Rastislavova 43, Košice, 041 90, Slovakia