1. Department of Orthodontics; Institute of Odontology; The Sahlgrenska Academy; University of Gothenburg; Gothenburg Sweden
2. Department of Orthodontics; University Clinics of Odontology; Public Dental Service; Gothenburg Sweden
3. Institute of Health and Care Sciences; The Sahlgrenska Academy; University of Gothenburg; Gothenburg Sweden
4. Østfold University College; Halden Norway