1 Department of Neurology, Sanjay Gandhi Post Graduate Institute of Medical Sciences, Rae Bareli, Lucknow, 226014, India. Electronic address: jkalita@sgpgi.ac.in.
2 Department of Neurology, Sanjay Gandhi Post Graduate Institute of Medical Sciences, Rae Bareli, Lucknow, 226014, India.
3 Department of Neurology, Vivekananda Polyclinic & Institute of Medical Sciences, Lucknow, 226014, India.