Clinic of Cranio-Maxillofacial and Oral Surgery, Centre of Dental Medicine, University of Zurich, Plattenstrasse 11, 8032, Zurich, Switzerland

Josipa Radic, Bernd Stadlinger, Martin Rücker & Barbara Giacomelli-Hiestand

Clinic for Orthodontics and Paediatric Dentistry, Centre of Dental Medicine, University of Zurich, Plattenstrasse 11, 8032, Zurich, Switzerland

Raphael Patcas

Statistical Services, Centre of Dental Medicine, University of Zurich, Plattenstrasse 11, 8032, Zurich, Switzerland

Daniel Wiedemeier

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JR wrote the ethics application together with BGH and BS. JR performed the data collection. JR performed the data analysis together with DW and prepared the manuscript. RP, BS and BGH designed the study, controlled the study and corrected the manuscript. MR edited the manuscript. DW performed the statistical study setup and analysis. All authors read and approved the final manuscript.