M Tomek1, A Nandoskar2, N Chapman2, C Gabriel2. 1. From the Department of Medicine, Charing Cross Hospital, Department of Neurology, Department of Clinical Pharmacology, St Mary's Hospital, Imperial College Healthcare NHS Trust, London, UK michal.tomek@cantab.net. 2. From the Department of Medicine, Charing Cross Hospital, Department of Neurology, Department of Clinical Pharmacology, St Mary's Hospital, Imperial College Healthcare NHS Trust, London, UK.