1. Department of Anatomy, Histology with Embryology and Cytology; Institute of Preclinical Sciences; Veterinary Faculty; University of Ljubljana; Gerbiceva 60 Ljubljana 1000 Slovenia
2. Department of Prosthodontics; Faculty of Medicine; University of Ljubljana; Hrvatski Trg 6 Ljubljana 1000 Slovenia
3. Department of Prosthodontics; Faculty of Dental Medicine; University of St. Cyril and Methodius; Vodnjanska 17 Skopje 1000 Macedonia
4. Division of Biomedical Research; Medical University of Graz; Roseggerweg 48 Graz 8036 Austria
5. Department of Dental Diseases and Normal Dental Morphology, Faculty of Medicine; University of Ljubljana; Hrvatski Trg 6 Ljubljana 1000 Slovenia
6. Clinical Institute of Clinical Chemistry and Biochemistry, University Medical Centre Ljubljana; Njegoševa 4 1000 Ljubljana Slovenia