Jong, R. P., and K. Osman. “Estimation of Mitral Valve Degeneration With Mitral Regurgitation”. Borneo International Journal eISSN 2636-9826 2, no. 2 (December 12, 2019): 1-15. Accessed April 20, 2024. https://majmuah.com/journal/index.php/bij/article/view/37.