1. Department of Neurology, Bangur Institute of Neurosciences, IPGMER and SSKM Hospital, Annex 1, 52/1 Shambhunath Pandit Street, Kolkata 700020, West Bengal, India
2. Department of Internal Medicine, RG Kar Medical College and Hospital, Khudiram Bose Sarani, Kolkata 700004, West Bengal, India