Zahid, M., N. Tahir, K. H. M. Quadri, A. Azhar, M. M. Shabir, A. Wahab, U. Urfi, K. . Waqar, and D. Nadeem. “Mental Health Status of Medical Staff Working in Hospitals During COVID-19 Pandemic in Pakistan: A Cross-Sectional Study”. Principles and Practice of Clinical Research, vol. 8, no. 1, Apr. 2022, doi:10.21801/ppcrj.2022.81.1.