1. Neurotology Unit, ENT Department, University Hospital of Salamanca, IBSAL, 37007 Salamanca, Spain
2. Neurotology Unit, Neurology Department, University Hospital of Salamanca, IBSAL, 37007 Salamanca, Spain
3. Department of Clinical and Movement Neurosciences, Institute of Neurology, UCL, London WC1N 3BG, UK
4. ENT Department, Faculty of Medicine, University of Salamanca, 37007 Salamanca, Spain