The objective of this study is just to investigate the univariate time series models for forecasting because we
have the limited data available. The utilization of other variables (presumably data are available), e.g. air pollution,
temperature, humidity, sunlight, rainfall, populations, people’s incomes probably much more useful. As cohort
studies are also important in epidemiology, the merging of time-series and cohort studies is an interesting future
research direction.