1. Department of Experimental Otology, Institute of Audioneurotechnology, Medical University Hannover, Feodor-Lynen-Strasse 35, 30625 Hannover, Germany
2. Institute of Sensory Physiology and Neurophysiology, J.W. Goethe University, Theodor-Stern-Kai 7, 60325 Frankfurt am Main, Germany
3. MedEl Company, Fürstenweg 77a, 6020 Innsbruck, Austria