1. Institute of Materials Research Slovak Academy of Sciences Košice Slovak Republic
2. Department of Stomatology and Maxilofacial Surgery, University Hospital University of Pavol Jozef Šafárik Košice Slovak Republic
3. Faculty of Medicine University of Pavol Jozef Šafárik Košice Slovak Republic
4. Donát Bánki Faculty of Mechanical and Safety Engineering Óbuda University Budapest Hungary