1. School of Medicine, University of Pula, Zagrebačka 30, 52100 Pula, Croatia
2. Department of Periodontology, School of Dental Medicine, University of Zagreb, Gunduliceva 5, 10000 Zagreb, Croatia
3. Health Center Zagreb, Runjaninova 4, 10000 Zagreb, Croatia
4. University Dental Clinic, University Hospital Centre Zagreb, Kišpatićeva 12, 10000 Zagreb, Croatia