1. Department of Cardiac Surgery and
2. NHC Key Laboratory of Assisted Circulation, Sun Yat-sen University, Guangzhou, China;
3. Department of Anesthesiology, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China;
4. Center for Stem Cell Biology and Tissue Engineering, Key Laboratory for Stem Cells and Tissue Engineering, Sun Yat-sen University, Guangzhou, China; and
5. Sun Yat-sen University, Guangzhou, China