1. Flemish-Netherlands Geriatric Oral Research Group; BENECOMO; Nijmegen The Netherlands
2. Department of Oral Function and Prosthetic Dentistry; Radboud University Nijmegen Medical Centre; Nijmegen The Netherlands
3. Department of Community Dentistry and Oral Public Health; Dental School; Ghent University; Ghent Belgium
4. Caphri/Department of Family Medicine and Department of Health Services Research; Maastricht University; Maastricht The Netherlands
5. Center for Dentistry and Oral Hygiene; University Medical Center Groningen; Groningen The Netherlands
6. Department of Oral Biochemistry; Academic Centre for Dentistry Amsterdam; Amsterdam The Netherlands