[1] Royal Victoria Infirm, Dept Neurol, Newcastle Upon Tyne NE1 4LP, Tyne & Wear, England
[2] Royal Victoria Infirm, Dept Neurophysiol, Newcastle Upon Tyne NE1 4LP, Tyne & Wear, England
[3] Royal Victoria Infirm, Dept Rheumatol, Newcastle Upon Tyne NE1 4LP, Tyne & Wear, England