Jin, Lei, Guan-xin Zhang, Lin Han, and Chong Wang. “Baseline and Outcome Characteristics of Multiple Valve Surgery Compared With Single Valve Procedures in Mainland China: A Multicenter Experience”. The Heart Surgery Forum 22, no. 6 (December 17, 2019): E486-E493. Accessed August 8, 2020. https://journal.hsforum.com/index.php/HSF/article/view/2369.