Zhu, Jinguo, and Lihua Xiong. “CD4+CD25+Treg Cells Prolong the Survival Time of Heart Allograft Via Induction Lymphocyte Apoptosis and Modulation the Ratio of T Cell Subsets”. Cardiology and Cardiovascular Medicine, vol. 6, no. 2, Mar. 2022, pp. 71-82, http://www.fortunejournals.org/ojs/index.php/ccm/article/view/16207.