D. Hadi, J. . Siregar, N. . Novisari Soeroso, and A. M. Nafchi, “Differences In D-Dimer Levels of Moderate And Severe Covid-19 Patients Treated At Hajj Adam Malik Hospital, Medan”, IJHP, vol. 5, no. 1, pp. 10–17, Feb. 2025.