1. Department of Reconstructive Dentistry and Gerodontology, School of Dental Medicine University of Bern Bern Switzerland
2. Private Practice, Zahnarzt Praxis Gadzo AG Interlaken Switzerland
3. Department of Prosthodontics, Faculty of Dentistry Osmangazi University Eskisehir Turkey
4. Translational Medicine Research and Clinical Center Osmangazi University Eskisehir Turkey
5. Division of Gerodontology and Removable Prosthodontics, University Clinics of Dental Medicine University of Geneva Geneva Switzerland
6. Department of Restorative, Preventive and Pediatric Dentistry, School of Dental Medicine University of Bern Bern Switzerland
7. Division of Restorative and Prosthetic Dentistry The Ohio State University Ohio USA
8. Department of Prosthodontics, Faculty of Dentistry Istinye University İstanbul Turkey