Evaluation of Peripheral Oxygen Saturation after Wearing Different Face Masks and Related Anxiety in Healthcare Workers Amid COVID-19 Pandemic at A Tertiary Care Facility in Province of Sindh. mfm [Internet]. 2021 Feb. 8 [cited 2026 Apr. 15];32(1). Available from: http://medicalforummonthly.com/index.php/mfm/article/view/2115