De Silva, A.P.Aryasingha, S.Dassanayake, A.S.Hevavisenthi, J.Ratnasena, B.G.N.De Silva, H.J.2016-01-142016-01-142008The Ceylon Medical Journal, 53(1)pp.22-23https://dl.nsf.gov.lk/handle/1/21849Article