Clovis J Rau1, Lovisa Terling2, Samer Elkhodair1, Diego Kaski3,4. 1. Department of Emergency Medicine, University College London Hospitals, Gower Street, London, UK. 2. Department of Medicine, Lund University, Lund, Sweden. 3. Department of Clinical and Motor Neurosciences. 4. Department of Neuro-otology, Royal National ENT and Eastman Dental Hospitals, London, UK.