1. The Department of Otorhinolaryngology, Head and Neck Surgery, Comprehensive Hearing Centre at Katholisches Klinikum, Ruhr-University, Bochum, Germany
2. The Department for Neuropsychology, University of Cologne, Cologne, Germany
3. The Department of Otorhinolaryngology, Head and Neck Surgery, St. Johannes-Hospital Dortmund, Dortmund, Germany