1. Institute of Human Genetics; University Medical Center Göttingen; Göttingen Germany
2. Institute of Human Genetics; University of Cologne; Cologne Germany
3. Cologne Center for Genomics; University of Cologne; Cologne Germany
4. The Centre for Deafblindness and Hearing Loss; Aalborg Denmark
5. Department of Clinical Genetics; Aarhus University Hospital; Aarhus Denmark