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2025. 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. 24, 1 (Jun. 2025), 45–53. DOI:https://doi.org/10.5281/zenodo.15625603.