Sananta, P., N. A. Qurotu’ain, D. Widasmara, and E. Noviya. “Correlation Between Grade of Knee Osteoarthritis With Quality of Life of Patient in Secondary Referral Hospital in Indonesia”. Open Access Macedonian Journal of Medical Sciences, vol. 10, no. B, Apr. 2022, pp. 993-6, doi:10.3889/oamjms.2022.9326.