1. Department of Neurology; Institute of Neurological Sciences; Queen Elizabeth University Hospital; Glasgow UK
2. Department of Neurology; Royal Victoria Infirmary; Newcastle -upon-Tyne UK
3. Department of Clinical Neurophysiology; Royal Victoria Infirmary; Newcastle -upon-Tyne UK
4. Institute of Neuroscience; Newcastle University; Newcastle -upon-Tyne UK
5. Department of Neurophysiology; Institute of Neurological Sciences; Queen Elizabeth University Hospital; Glasgow UK