Sumit Kumar1, Jayantee Kalita2, Usha K Misra1. 1. Department of Neurology, Sanjay Gandhi Post Graduate Institute of Medical Sciences, Lucknow, 226014, India. 2. Department of Neurology, Sanjay Gandhi Post Graduate Institute of Medical Sciences, Lucknow, 226014, India. Electronic address: jayanteek@yahoo.com.