Cheema, Ahmed Ammar, et al. “Comparison of Respiratory Complications of COVID-19 Among Patients With Rheumatological Conditions Taking Biological Disease-Modifying Anti-Rheumatic Drugs and Conventional Synthetic Disease-Modifying Antirheumatic Drugs”. Pakistan Armed Forces Medical Journal, vol. 72, no. 4, Sept. 2022, pp. 1355-58, https://doi.org/10.51253/pafmj.v72i4.4498.