[1] Inst Post Grad Med Educ & Res, Bangur Inst Neurosci, Dept Neurol, Kolkata, West Bengal, India
[2] Medanta Hosp, Dept Radiol, Patna, Bihar, India
[3] Inst Post Grad Med Educ & Res, Bangur Inst Neurosci, Dept Neurol, 52-1A Shambu Nath Pandit St, Kolkata 700025, West Bengal, India