Muhammad Mufti Sofyanoor, Y. Widyastuti, Juni Kurniawaty, and Djayanti Sari, “Validity of Acute Physiology and Chronic Health Evaluation (APACHE) IV for the Prediction of Prolonged Intensive Care Unit (ICU) Length of Stay in Dr. Sardjito General Hospital in the COVID Era”, JACR, vol. 4, no. 2, pp. 426-433, May 2023.