1. Department of Cardiology, Qilu Hospital of Shandong University, Jinan, Shandong 250012, P.R. China
2. Department of Cardiology, Yantaishan Hospital, Yantai, Shandong 264001, P.R. China
3. Department of Thoracic Surgery, People's Hospital of Zhejiang Province, Hangzhou, Zhejiang 310014, P.R. China
4. Department of Nephrology, Yantaishan Hospital, Yantai, Shandong 264001, P.R. China