1. Västervik Public Dental Service, Kalmar County Council, Kalmar, Sweden
2. Department of Biomedical and Clinical Sciences, Linköping University, Linköping, Sweden
3. Department of Clinical Physiology, Region Kalmar Council, Kalmar, Sweden
4. Department of Medical and Health Sciences, Linköping University, Linköping, Sweden
5. Center for Orthodontics and Pediatric Dentistry, Norrköping, Sweden