1. Zentrum für Plastische Chirurgie Pyramid Clinic Zurich Switzerland
2. Department of Hand and Plastic Surgery Luzerner Kantonsspital Lucerne Switzerland
3. Department of Health Sciences and Medicine University of Lucerne Lucerne Switzerland
4. Department of Oral and Maxillofacial Surgery Luzerner Kantonsspital Lucerne Switzerland
5. Department of Otolaryngology, Head & Neck Surgery Luzerner Kantonsspital Lucerne Switzerland
6. Otolaryngology, Head & Neck Surgery, Medical School University of Western Australia Perth Western Australia Australia