1. Department of Oto-Rhino-Laryngology, Plastic, Aesthetic and Reconstructive Head and Neck Surgery, University of Würzburg, Würzburg, Germany.
2. Chair of Tissue Engineering and Regenerative Medicine, University Hospital Wuerzburg, Würzburg, Germany.
3. Department of Otorhinolaryngology, Head and Neck Surgery, Kepler University Hospital, Linz, Austria.