1. Department of Cardiovascular Ultrasound, The First Hospital of China Medical University , No. 155 Nanjingbei Street, Heping District, Shenyang 110001 , China
2. Department of Ultrasound, Shengjing Hospital of China Medical University , No. 36 Sanhao Street, Heping District, Shenyang 110004 , China
3. Department of Cardiovascular Ultrasound, Mineral Hospital of Liaoning Provincial Health Industry Group , Fushun , China
4. Department of Ultrasonic Medicine, Central Hospital of Dalian University of Technology , Dalian , China
5. Department of Ultrasound, Zibo Municipal Hospital , Zibo , China
6. Department of Cardiovascular Ultrasound, The Second Affiliated Hospital of Dalian Medical University , Dalian , China
7. Ultrasound Medical Center, ShanXi Province People’s Hospital , Xi’an , China
8. Department of Cardiovascular Ultrasound, Chaoyang Central Hospital , Chaoyang , China
9. Department of Ultrasound Medicine, Baoji Central Hospital , Baoji , China
10. Special Inspection Section, Liaocheng People’s Hospital , Liaocheng , China
11. Department of Ultrasound, Jilin Central General Hospital , Jilin , China
12. Department of Ultrasound Diagnosis, Xianyang Central Hospital , Xianyang , China
13. Department of Ultrasound, Dali Bai Autonomous Prefecture People’s Hospital , Dali , China
14. Depatment of Cardiovascular Ultrasound, The First People’s Hospital of Foshan , Foshan , China
15. Department of Cardiac Function, The People’s Hospital of Liaoning Province , Shenyang , China
16. Department of Ultrasound Diagnosis, The First Affiliated Hospital, School of Medicine, Shihezi University , Shihezi , China
17. Department of Ultrasound in Medicine, Chengdu Wenjiang District People’s Hospital , Chengdu , China
18. Department of Ultrasound, The Second People’s Hospital of Baiyin City , Baiyin , China
19. Department of Ultrasound, Tangshan Fengnan District Hospital , Tangshan , China