Applicability of the APACHE II model to a lower middle income country by Haniffa, R, Pubudu De Silva, A, Weerathunga, P, Mukaka, M, Athapattu, P, Munasinghe, S, Mahesh, B, Mahipala, P, De Silva, T, Abayadeera, A, Jayasinghe, S, de Keizer, N, Dondorp, A