Sugiarto, Adhrie, Pryambodho, Meilina Imelda, and Dita Aditianingsih. “Charlson Comorbidity Index to Predict 28-Day Mortality in Critically Ill COVID-19 Patients”. Medical Journal of Indonesia 32, no. 1 (June 26, 2023): 19–24. Accessed November 28, 2024. https://mji.ui.ac.id/journal/index.php/mji/article/view/6070.