1. Clinic of General, Special Care and Geriatric Dentistry, Center of Dental Medicine University of Zurich Zurich Switzerland
2. Division of Gerodontology and Removable Prosthodontics University Clinics of Dental Medicine, University of Geneva Geneva Switzerland
3. Division of Internal Medicine for the aged, Department of Rehabilitation and Geriatrics Geneva University Hospitals Thônex Switzerland
4. Division of Geriatrics and Rehabilitation, Department of Rehabilitation and Geriatrics Geneva University Hospitals Thônex Switzerland
5. Department of Rehabilitation and Geriatrics University of Geneva Geneva Switzerland