1. First Department of Otolaryngology, Hippokration General Hospital, National and Kapodistrian University of Athens, 15772 Athens, Greece
2. Department of Oral and Maxillofacial Surgery, George Papanikolaou General Hospital, 56429 Thessaloniki, Greece
3. Department of Otorhinolaryngology—Head and Neck Surgery, Hannover Medical School, 30625 Hanover, Germany
4. Cluster of Excellence Hearing4all, German Research Foundation, 30625 Hannover, Germany