1. Reta Lila Weston Institute of Neurological Studies, UCL Queen Square Institute of Neurology, University College London, London, UK
2. The National Hospital for Neurology and Neurosurgery, Queen Square, London, UK
3. Department of Clinical and Movement Neurosciences, University College London, London, UK
4. Department of Neuro-Otology, Charing Cross Hospital, Imperial College London, London, UK
5. Escuela de Fonoaudiologia, Facultad de Medicina, Clinica Alemana Universidad del Desarrollo, Santiago, Chile
6. Department of Neurology, Innsbruck Medical University, Innsbruck, Austria