1. Department of Plastic and Hand Surgery, Inselspital, Bern University Hospital, University of Bern, 3010 Bern, Switzerland
2. Department of Otorhinolaryngology, Head and Neck Surgery, Inselspital, Bern University Hospital, University of Bern, 3008 Bern, Switzerland
3. Department of Cranio-Maxillofacial Surgery, Inselspital, Bern University Hospital, University of Bern, 3010 Bern, Switzerland
4. Department for BioMedical Research, University of Bern, 3010 Bern, Switzerland