Wijegunawardana, N.D.A.D.; Gunawardene, Y.I.N.S.; Manamperi, A.; Senarathne, H.; Abeyewickreme, W.(SEAMEO Regional Tropical Medicine and Public Health Project, 2012)
Perera, P.J.; Disanayake, D.; Fernando, M.P.; Warnakulasooriya, T.D.; Ranathunga, N.(SEAMEO Regional Tropical Medicine and Public Health Project, 2012)