1. Department of Ultrasound in Medicine, The Fourth Affiliated Hospital of Zhejiang University School of Medicine, N1 Shangcheng Road, Yiwu 322000, Zhejiang, China
2. Department of Ultrasound in Medicine, The Second Affiliated Hospital Zhejiang University School of Medicine, No. 88, Jiefang Road, Hangzhou, Zhejiang 310009, China