1. Unit of Orthodontics, Division of Dentistry IRCCS Ospedale San Raffaele Scientific Institute, Milan, Italy

2. Unit of Orthodontics, School of Dentistry, Vita-Salute San Raffaele University, Milan, Italy

3. Unit of Dentistry, Research Center for Oral Pathology and Implantology, IRCCS Ospedale San Raffaele, Milan, Italy

4. Department of Orthodontics, Faculty of Odontology, Malmő University, Malmő, Sweden

5. Department of Medicine, Surgery and Dentistry, Section of Orthodontics, University of Milan, Milan, Italy

6. Department of General Surgery and Surgical-Medical Specialties, School of Dentistry, University of Catania, Policlinico Universitario “Vittorio Emanuele - G. Rodolico”, Catania, Italy

7. Private Practice Milano, Pavia and Bologna, Milan, Italy