1. Department of Plastic Surgery University of Pittsburgh Pittsburgh Pennsylvania USA
2. Ruprecht Karls University of Heidelberg, Faculty of Medicine Mannheim Mannheim Germany
3. Department of Otorhinolaryngology, Head and Neck Surgery University Medical Centre Mannheim Mannheim Germany
4. Ruprecht Karls University of Heidelberg, Faculty of Medicine Heidelberg Heidelberg Germany
5. University of Damascus, Faculty of Pharmacy Damascus Syria
6. University of Pittsburgh Medical Center, Department of Neuroradiology Pittsburgh Pennsylvania USA
7. Department of Otorhinolaryngology Head and Neck Surgery, Charité‐Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt‐Universität zu Berlin and Berlin Institute of Health Campus Benjamin Franklin Berlin Germany