Abdulganiyu, Salami, and Mamman Tijjani. “Healthcare Expenditure and Life Expectancy in Africa: A Panel Study”. South Asian Journal of Social Studies and Economics 9, no. 4 (February 9, 2021): 1-9. Accessed March 2, 2021. https://journalsajsse.com/index.php/SAJSSE/article/view/30246.