1. Dental Public Health and Policy, School of Dentistry Virginia Commonwealth University Richmond Virginia USA
2. Dentalni Center Celesnik Bled Slovenia
3. Department for Oral Diseases and Periodontology, Division for Dental Medicine, Faculty of Medicine University of Ljubljana Ljubljana Slovenia
4. Department of Oral and Maxillofacial Surgery, School of Dentistry Virginia Commonwealth University Richmond Virginia USA
5. Department of Periodontics, School of Dentistry Virginia Commonwealth University Richmond Virginia USA