Setiawan, Yenny Frida. “FRAILTY AND MORTALITY ASSOCIATION IN PATIENTS WITH COVID-19: A SYSTEMATIC REVIEW”. Journal of Advanced Research in Medical and Health Science (ISSN 2208-2425) 8, no. 11 (November 22, 2022): 21–27. Accessed January 18, 2025. https://jarmhs.com/MHS/index.php/mhs/article/view/76.