The Face mask and changes in the blood oxygen saturation of theatre workers at the Nnamdi Azikiwe University Teaching Hospital, Nnewi, Anambra State: Blood Oxygen changes among theatre users using facemask in Nigeria. Tropical Journal of Medical Research, Nigeria, v. 24, n. 1, p. 45–53, 2025. DOI: 10.5281/zenodo.15625603. Disponível em: https://tjmr.org.ng/index.php/tjmr/article/view/197. Acesso em: 23 oct. 2026.