1. Department of Otorhinolaryngology, Head and Neck Surgery, University Hospital Essen, Essen, Germany
2. Institute of Human Genetics, University Hospital Essen, Essen, Germany
3. Laboratory of human genetic, diagenos, Osnabrück, Germany
4. Division of Interventional Radiology, Department of Radiology and Biomedical Imaging, Yale School of Medicine, New Haven, Connecticut, USA