Arinze Duke George Nwosu, Edmund Ndudi Ossai, Okechukwu Onwuasoigwe, and Francis Ahaotu. “Oxygen Saturation and Perceived Discomfort With Face Mask Types, in the Era of COVID-19: A Hospital-Based Cross-Sectional Study”. Pan African Medical Journal 39, no. 1 (July 16, 2021). Accessed August 12, 2026. https://www.ajol.info/index.php/pamj/article/view/221761.