1. Orthodontics, Oral and Maxillofacial Diseases University of Helsinki Helsinki Finland
2. Department of Community Dentistry, Institute of Dentistry University of Turku Turku Finland
3. Department of Neurosciences, Reproductive Sciences and Oral Sciences, School of Orthodontics and Temporomandibular Disorders University of Naples Federico II Naples Italy
4. Pediatric Dentistry and Orthodontics University of Turku Turku Finland
5. Orthodontics, Oral and Maxillofacial Diseases Helsinki University Hospital Helsinki Finland