1. Department of Orthodontics, Faculty of Dentistry, School of Health Sciences, Aristotle University of Thessaloniki , Thessaloniki , Greece
2. Clinic of Orthodontics and Pediatric Dentistry, Center of Dental Medicine, University of Zurich , Zurich , Switzerland
3. Department of Orthodontics, Faculty of Dentistry, University Medical Center Göttingen , Göttingen, Germany
4. Department of Paediatric Dentistry and Orthodontics, Faculty of Dentistry, Universidad de La Frontera (UFRO) , Temuco, Chile
5. Department of Dentistry, School of Medicine, European University Cyprus , Nicosia , Cyprus
6. Hamdan Bin Mohammed College of Dental Medicine, Mohammed Bin Rashid University of Medicine and Health Sciences , Dubai , UAE