2 Department of Anesthesiology, the 305 Hospital of People's Liberation Army, Beijing 100017, China.
3 Department of Cardiology, Hainan Hospital of Chinese People's Liberation Army General Hospital, Hainan Geriatric Disease Clinical Medical Research Center, Hainan Branch of China Geriatric Disease Clinical Research Center, Sanya 572016, China; Department of Geriatric Cardiology, Chinese People's Liberation Army General Hospital, Beijing 100853, China. Electronic address: xiaoxiao0915@126.com.