1. Department of General and Endocrine Surgery, Onze-Lieve-Vrouw (OLV) Clinic Aalst, Aalst, Belgium
2. Department of Head, Neck and Maxillofacial Surgery, University Hospital Ghent, Ghent, Belgium
3. Department of General Surgery, AZ Damiaan, Ostend, Belgium
4. Centre for Translational Microbiome Research, Department of Microbiology, Tumour and Cell biology, Karolinska Institutet, Karolinska Hospital, Stockholm, Sweden
5. Department of Otorhinolaryngology, University Hospital Ghent, Ghent, Belgium
6. Department of Plastic and Reconstructive Surgery, University Hospital Ghent, Ghent, Belgium