1. Public Dental Health Norrstrand Värmland; Karlstad Sweden
2. Preventive Dentistry Department; Public Dental Health Värmland; Karlstad Sweden
3. Department of Dental Medicine; Academic Centre of Geriatric Dentistry; Karolinska Institutet; Stockholm Sweden
4. Preventive Dentistry Department; Public Dental Health Värmland and Institute of Odontology; Sahlgrenska Academy; University of Gothenburg; Gothenburg Sweden