1. Department of Hygiene, Social‐Preventive Medicine & Medical Statistics, Medical School Aristotle University of Thessaloniki Thessaloniki Greece
2. Private practice Hengelo The Netherlands
3. Clinic of Orthodontics and Pediatric Dentistry, Center of Dental Medicine University of Zurich Zurich Switzerland
4. Department of Orthodontics, Faculty of Dentistry Aristotle University of Thessaloniki Thessaloniki Greece
5. Second Medical Department, Clinical Research and Evidence‐Based Medicine Unit Aristotle University of Thessaloniki Thessaloniki Greece