1. University of Zagreb School of Dental Medicine Department of Physiology Šalata 3 10 000 Zagreb Croatia
2. University Hospital Center Zagreb Department of Laboratory Diagnostics Zagreb Croatia
3. University of Rijeka Faculty of Dental Medicine Department of Orthodontics Rijeka Croatia
4. Josip Juraj Strossmayer University of Osijek Faculty of Dental Medicine and Health Department of Dental Medicine Osijek Croatia
5. University of Zagreb School of Dental Medicine, Postgraduate student Zagreb Croatia