Onah, Paul Otor, and Siyaka Abdulateef. “Catastrophic Out of Pocket Medicine Expenditure: A Case for Monitoring Performance of Primary Providers on National Health Insurance Scheme: Https: doi.org 10.51412 Psnnjp.2023.33”. The Nigerian Journal of Pharmacy, vol. 57, no. 2, Oct. 2023, pp. 730-4, https://psnnjp.org/index.php/home/article/view/497.