Pu, Lei, et al. “Underdiagnosed Pulmonary Artery Thrombosis and Pulmonary Embolism in Rheumatic Heart Disease”. Cardiology and Cardiovascular Medicine, vol. 3, no. 2, Mar. 2019, pp. 30-33, http://www.fortunejournals.org/ojs/index.php/ccm/article/view/15614.