1 Medical University Graz, University Clinic of Dental Medicine and Oral Health, Department of Oral Surgery and Orthodontics, Billrothgasse 4, 8010 Graz, Austria. Electronic address: astrid.truschnegg@medunigraz.at.
2 Medical University Graz, University Clinic of Dental Medicine and Oral Health, Department of Oral Surgery and Orthodontics, Billrothgasse 4, 8010 Graz, Austria.