The tip of the iceberg: evidence of seasonality in institutional maternal mortality and implications for health resources management in Burkina Faso. by Hounton, S, Sombie, I, Townend, J, Ouedraogo, T, Meda, N, Graham, W

“…A statistical smoothing procedure (T4253H) and Freedman's test were used to investigate seasonality and association with malaria, rainfall or household income variations. …”