1. Department of Reconstructive Dentistry and Gerodontology, School of Dental Medicine University of Bern Bern Switzerland
2. Division of Gerodontology and Removable Prosthodontics, University Clinics of Dental Medicine University of Geneva Geneva Switzerland
3. Private Practice Weinfelden Switzerland
4. Clinic of Preventive Dentistry, Periodontology and Cariology, and Clinic of General, Special Care and Geriatric Dentistry, Center of Dental Medicine University of Zurich Zurich Switzerland
5. Department of Oral Surgery and Stomatology, School of Dental Medicine University of Bern Bern Switzerland