Frida Setiawan, Y. 2022. 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, 11 (Nov. 2022), 1–7. DOI:https://doi.org/10.53555/nnmhs.v8i11.1427.