1. Department of Orthodontics; Pomeranian Medical University; Szczecin Poland
2. Department and Clinic of Maxillofacial Orthopaedics and Orthodontics; Poznan University of Medical Sciences; Poznań Poland
3. Department of Maxillofacial Orthopaedics and Orthodontics; Wroclaw Medical University; Wrocław Poland
4. Division of Facial Abnormalities; Department of Maxillofacial Orthopaedics and Orthodontics; Wroclaw Medical University; Wrocław Poland