Robert Gürkov1, Rita Fernandes Sousa2, Jing Zou3,4, Krisztina Barath5. 1. Ludwig-Maximilians-Universitat Munchen, Munich, Germany. guerkov@arcor.de. 2. CUF Cascais Hospital, Lisboa, Portugal. 3. Hearing and Balance Research Unit, University of Tampere, Tampere, Finland. 4. Department of Otolaryngology - Head and Neck Surgery, Changhai Hospital, Second Military Medical University, Shanghai, China. 5. Radiologie und Neuroradiologie am Glattzentrum, Wallisellen, Switzerland.