Chandrasena, T.G.A.N.; Premaratna, R.; de Alwis, A.C.; de Silva, L.D.R.; Morel, R.P.; de Silva, N.R.(SEAMEO Regional Tropical Medicine and Public Health Project, 2004)
Fernando, S.D.; Goonethilleke, H.; Weerasena, K.H.; Kuruppuarachchi, N.D.; Tilakaratne, D.; de Silva, D.; Wickremasinghe, A.R.(SEAMEO Regional Tropical Medicine and Public Health Project, 2001)