Affiliation: | 1. Clinic of Fixed and Removable Prosthodontics and Dental Material Science, University of Zurich, Zurich, Switzerland;2. Division of Fixed Prosthodontics and Biomaterials, University Clinics for Dental Medicine, University of Geneva, Geneva, Switzerland;3. Institute of Social and Preventive Medicine, University of Bern, Bern, Switzerland;4. Private Practice, Moscow, Russia;5. Division of Reconstructive Dentistry, Faculty of Odontology, University of Iceland, Reykjavik, Iceland |