[1] Sanjay Gandhi Postgrad Inst Med Sci, Dept Radiodiag, Lucknow 226014, Uttar Pradesh, India
[2] King Georges Med Univ, Dept Pathol, Lucknow, Uttar Pradesh, India
[3] King Georges Med Univ, Dept Neurosurg, Lucknow, Uttar Pradesh, India
[4] Sanjay Gandhi Postgrad Inst Med Sci, Dept Microbiol, Lucknow, Uttar Pradesh, India
[5] Sanjay Gandhi Postgrad Inst Med Sci, Dept Anaesthesiol, Lucknow, Uttar Pradesh, India
[6] Sanjay Gandhi Postgrad Inst Med Sci, Dept Neurosurg, Lucknow, Uttar Pradesh, India
[7] Indian Inst Technol, Dept Math, Kanpur 208016, Uttar Pradesh, India