Gunarathna EDTP, Mishra SP, Srivasthava VK, Singh OP, Biochemical analysis of serum anti oxidant levels after the leech therapy in the Management of Pakshaghata (CVA infarction), 2^nd  International Conference on Ayurveda, Siddha and Traditional Medicine Institute of Indigenous Medicine, University of Colombo, Rajagiriya, Sri Lanka16-18^th  December 2014