1. Department of Neurology, Bangur Institute of Neurosciences, IPGMER & SSKM Hospital Annex-1, 52/1a Shambhunath Pandit Street, Kolkata 700025, West Bengal, India
2. A. Chandra, Department of Internal Medicine, RG Kar Medical College and Hospital, 1, Khudiram Bose Sarani, Kolkata 700004, West Bengal, India