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Kwak YJ, M.d. , Ahn H, M.d. , Ph.d. , Choi JW, M.d. , Kim KH, M.d. , Ph.d. .  Long-Term Results of the Leaflet Extension Technique for Rheumatic Aortic Regurgitation: A 20-Year Follow-up.  Korean J Thorac Cardiovasc Surg 2019;52:9-15.  https://doi.org/10.5090/kjtcs.2019.52.1.9