title: Reply.
authors: Department of Cardiac Surgery, Beijing Anzhen Hospital, Capital Medical University, Beijing 100029, China.
authors: Bin
authors: B
authors: Cheng
authors: Department of Cardiac Surgery, Beijing Anzhen Hospital, Capital Medical University, Beijing 100029, China. Electronic address: wesleymu@hotmail.com.
authors: Junsheng
authors: J
authors: Mu