1. G.B. Pant Hospital; Department of Neurology; New Delhi India 110002
2. Sree Chitra Tirunal Institute for Medical Sciences and Technology; Department of Neurology; Trivandrum Kerala India 695011
3. University of Liverpool; Institute of Infection and Global Health; 8 West Derby Street Liverpool Merseyside UK L69 7BE
4. The Walton Centre NHS Foundation Trust; Liverpool UK