1. BENECOMO Flemish-Netherlands Geriatric Oral Research Group Ghent; Belgium/Nijmegen The Netherlands
2. Department of Oral Function and Prosthetic Dentistry; Radboud University Nijmegen Medical Centre; Nijmegen The Netherlands
3. Naarderheem; Vivium Zorggroep; Huizen The Netherlands
4. Department of Community Dentistry and Oral Public Health; Ghent University; Ghent Belgium
5. Birkhoven Zorggoed Amersfoort; Amersfoort The Netherlands
6. CAPHRI/Department of General Practice and Department of Health Services Research; Maastricht University; Maastricht The Netherlands