Iftikhar, Namirah, et al. “D-Dimer Levels As a Predictive Marker of Pulmonary Embolism in COVID-19 Patients”. Pakistan Journal of Medicine and Dentistry, vol. 13, no. 3, Aug. 2024, pp. 73-80, https://doi.org/10.36283/PJMD13-3/011.