1. Division of Fixed Prosthodontics and Biomaterials, University Clinics of Dental Medicine University of Geneva Geneva Switzerland
2. Clinic of Conservative and Preventive Dentistry, Division of Periodontology and Peri‐implant Diseases, Center of Dental Medicine University of Zürich Zürich Switzerland
3. Clinic of General, Special Care and Geriatric Dentistry, Center of Dental Medicine University of Zürich Zürich Switzerland
4. Division of Prosthodontics, Faculty of Dental Medicine University of Belgrade Belgrade Serbia
5. Private Dental Office Bern Switzerland