1 University Hospitals Birmingham NHS Trust, Queen Elizabeth University Hospital Mindelsohn Way Edgbaston, Birmingham, B15 2GW, England. Sangeeta1@doctors.net.uk.
2 College of Medical and Dental Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, England.
3 Manchester Centre for Clinical Neurosciences, Salford Royal NHS Foundation Trust, Salford, UK.
4 University of Manchester, Manchester, UK.
5 Royal Wolverhampton NHS Trust, Wolverhampton Road, Wolverhampton, West Midlands, WV10 0QP, England.
6 University Hospitals Birmingham NHS Trust, Queen Elizabeth University Hospital Mindelsohn Way Edgbaston, Birmingham, B15 2GW, England.
7 Department of Neurology, Sree Chitra Tirunal Institute of Medical Sciences and Technology, Kerala, 695011, India.