Bai, Kavita, Ramesh Kumar, Urooj Bhatti, Keenjhar Rani, and Mumtaz Ali Memon. 2021. “Association of Headache and Other Attributes to Duration of Wearing Face Mask During Pandemic COVID -19”. Pakistan Journal of Physiology 17 (1):26-29. https://doi.org/10.69656/pjp.v17i1.1293.