H. . Muflihah, S. . B. Rahiman, H. . S. Sastramihardja, and F. A. Yulianto, “Procalcitonin, but not D-dimer, is an Inapplicable Biomarker for Severe COVID-19”, KLS, vol. 7, no. 5, pp. 161–168, Dec. 2022.