[1] Wockhardt Hosp, Dept Neurosurg, Bombay, Maharashtra, India
[2] Postgrad Inst Med Educ & Res, Dept Neurosurg, Chandigarh, India
[3] Postgrad Inst Med Educ & Res, Dept Neurol, Chandigarh, India
[4] Postgrad Inst Med Educ & Res, Dept Radiol, Chandigarh, India
[5] Sanjay Gandhi Postgrad Inst Med Sci, Dept Neurosurg, Lucknow, Uttar Pradesh, India