1. Department of Oral Development and Orthodontics, Research Unit of Oral Health Sciences, Faculty of Medicine, University of Oulu
2. Oral and Maxillofacial Department, Oulu University Hospital, Medical Research Center Oulu
3. Department of Community Dentistry, Institute of Dentistry, University of Turku, Finland
4. Department of Orthodontics and Pediatric Dentistry, UZB-University School of Dental Medicine, University of Basel, Switzerland