1. Department of Public Health and Community Medicine/Primary Health Care, Institute of Medicine, Sahlgrenska Academy, University og Gothenburg, Gothenburg, Sweden;
2. Regionhälsan R&D Centre Skaraborg Primary Care, Skövde, Sweden;
3. Department of Behavioral and Community Dentistry, Institute of Odontology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden