Nandhagopal R, Vengamma B, Krishnamoorthy S G, Rajasekhar D, Subramanyam G
Department of Neurology, Sri Venkateswara Institute of Medical Sciences, Tirupati, Andhra Pradesh, India.
Neurology. 2005 Aug 9;65(3):494. doi: 10.1212/01.wnl.0000171339.96234.b5.