1. School of Education, Health and Social Studies Dalarna University Falun Sweden
2. Department of Public Health and Caring Sciences Family Medicine and Preventive Medicine Uppsala University Uppsala Sweden
3. School of Medicine and Health School of Health Sciences Örebro University Örebro Sweden
4. Dental Research Department Postgraduate Dental Education Center Örebro Sweden
5. Clinical Epidemiology and Biostatistics School of Medical Sciences Örebro University Örebro Sweden