Samsudin, Shamzaeffa, et al. “Does Health Insurance Ownership Determine Access and Frequency of Hospitalization? Evidence from the Two-Part Poisson Model”. International Journal of Economics and Financial Issues, vol. 6, no. 7S, Nov. 2016, pp. 21-26, https://mail.econjournals.com/index.php/ijefi/article/view/3570.