Ajith Cherian1, J Nandana1, K P Divya2, Sharath Chandra Shetty1. 1. Department of Neurology, Sree Chitra Tirunal Institute for Medical Sciences and Technology, Trivandrum, Kerala, 695011, India. 2. Department of Neurology, Sree Chitra Tirunal Institute for Medical Sciences and Technology, Trivandrum, Kerala, 695011, India. drdivyakp01@gmail.com.