Silvio Valdec and Jan M. Borm contributed equally to this work.

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

Silvio Valdec, Jan M. Borm, Stephanie Casparis, Georg Damerau, Michael Locher & Bernd Stadlinger

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SV and BS wrote the ethics application. JB and SC performed the data collection. JB performed the data analysis and prepared the manuscript together with SV. BS, DG and ML designed the study, controlled the study and corrected the manuscript. SV and BS edited the manuscript. All authors read and approved the final manuscript.

Correspondence to Bernd Stadlinger.