L. M. Ahmad, M. Hejazie, and M. I. Khayat, “D-dimer level as a prognostic factor in patients with acute exacerbation of chronic obstructive pulmonary disease at admission to hospital”, JMPS, vol. 6, no. 4, pp. 62–76, Sep. 2022, doi: 10.26389/AJSRP.N231221.