de Silva, A.P.; Niriella, M.A.; Perera, N.J.A.H.D.; Aryasingha, J.S.; Kalubowila, U.P.; Dassanayake, A.S.; Pathmeswaran, A.; Manchanayake, M.M.J.H.; Devanarayana, N.M.; de Silva, H.J.
(American Gastroenterological Association(AGA) Institute, Published by Elsevier Inc., 2009)