1 Department of Cardiovascular Surgery, West China Hospital, Sichuan University, Chengdu, Sichuan, PR China.
2 Department of Radiology, West China Hospital, Sichuan University, Chengdu, Sichuan, PR China.
3 Department of Cardiovascular Surgery, West China Hospital, Sichuan University, Chengdu, Sichuan, PR China. Electronic address: xiaozhenghua@wchscu.cn.