Ahmad, Lubana Mohamad, et al. “D-Dimer Level As a Prognostic Factor in Patients With Acute Exacerbation of Chronic Obstructive Pulmonary Disease at Admission to Hospital”. Journal of Medical and Pharmaceutical Sciences, vol. 6, no. 4, Sept. 2022, pp. 62-76, https://doi.org/10.26389/AJSRP.N231221.