a Magnetic Resonance Section, Department of Radiodiagnosis, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, India
b Department of Anesthesiology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, India
c Department of Neurology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, India
d Department of Neurology, CSMMU, Lucknow, India
e Department of Mathematics and Statistics, Indian Institute of Technology, Kanpur, India
f Department of Biostatistics, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, India