1. Department of Ultrasonography, Tongde Hospital of Zhejiang Province, Hangzhou, Zhejiang 310012, P.R. China
2. Department of Cardiology, The Affiliated Hospital of Hangzhou Normal University, Hangzhou, Zhejiang 310000, P.R. China
3. Type‑B Ultrasonic Room, Heart Center, The Affiliated Hospital of Hangzhou Normal University, Hangzhou, Zhejiang 310000, P.R. China