1. Department of Ultrasound, Third Hospital of Shanxi Medical University, Shanxi Bethune Hospital, Shanxi Academy of Medical Sciences, Shanxi Tongji Hospital, Taiyuan, China
2. Department of Ultrasound, Sixth Hospital of Shanxi Medical University, Taiyuan, China
3. Device management and maintenance center, Third Hospital of Shanxi Medical University, Shanxi Bethune Hospital, Shanxi Academy of Medical Sciences, Shanxi Tongji Hospital, Taiyuan, China