ARINZE DUKE GEORGE NWOSU; EDMUND NDUDI OSSAI; OKECHUKWU ONWUASOIGWE; 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, [S. l.], v. 39, n. 1, 2021. DOI: 10.11604/pamj.2021.39.203.28266. Disponível em: https://www.ajol.info/index.php/pamj/article/view/221761. Acesso em: 12 aug. 2026.