1. Department of Orthodontics, Public Dental Health Service, Eskilstuna, Sweden
2. Department of Orthodontics, Postgraduate Dental Education Center, Örebro, Sweden
3. Dental Research Department, Public Dental Service, Region Örebro County, Örebro, Sweden
4. School of Health Sciences, Örebro University, Örebro, Sweden
5. Department of Orthodontics, The Institute for Postgraduate Dental Education, Jönköping, Sweden
6. Department of Paediatric Dentistry, The Institute for Postgraduate Dental Education, Jönköping, Sweden
7. Department of Paediatric Dentistry, Postgraduate Dental Education Center, Örebro, Sweden
8. School of Medical Sciences, Faculty of Medicine and Health, Örebro University, Örebro, Sweden