Dogruyol, Sinem, Abdullah Osman Kocak, Ilker Akbas, and Zeynep Çakır. “The Charlson Comorbidity Index: Predicting Readmission and Severity in Emergency Departments”. European Journal of Clinical and Experimental Medicine 19, no. 4 (December 30, 2021): 313–317. Accessed February 27, 2026. https://journals.ur.edu.pl/ejcem/article/view/11915.