1. University Department of Otorhinolaryngology, Head and Neck Surgery, Inselspital Bern, Switzerland
2. Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD, USA
3. Johns Hopkins Biostatistics Center, Baltimore, MD, USA
4. Department of Otolaryngology – Head and Neck Surgery, Johns Hopkins University School of Medicine, Baltimore, MD, USA
5. Department of Neurology, Illinois Neurologic Institute, University of Illinois, College of Medicine, Peoria, IL, USA