1. 1 Cardiac Valve Center, Department of Cardiac Surgery, Beijing Anzhen Hospital, Capital Medical University-Beijing Institute of Heart Lung and Blood Vessel Diseases, Beijing, China
2. 2 Center of Cardiovascular Surgery, The People's Hospital of Huaiyin Jinan, Jinan, Shandong, China
3. 3 Department of Cardiovascular Surgery, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui, China