Department of Ultrasound, Aerospace Center Hospital, Beijing 100049, China;
Department of Ultrasound, PLA Army General Hospital, Beijing 100700, China;
Department of Ultrasound, PLA Army General Hospital, Beijing 100700, China;
Department of Ultrasound, PLA Army General Hospital, Beijing 100700, China;
Department of Ultrasound, PLA Army General Hospital, Beijing 100700, China;
Department of Ultrasound, PLA Army General Hospital, Beijing 100700, China;