“Estimation of the Family and Community Unobserved Heterogeneity Effects on the Risk of Under-Five Mortality in Nigeria Using Frailty Model”. International Journal of Child Health and Nutrition 9, no. 1 (March 16, 2020): 17–25. Accessed January 16, 2026. https://neolifescience.com/index.php/ijchn/article/view/6468.