1. Department of Interventional Ultrasound, Chinese PLA General Hospital, Beijing, PR China;
2. Department of Ultrasound, Shandong Provincial Qianfoshan Hospital, Shandong University, Jinan, Shandong, PR China;
3. Department of Ultrasound, Beijing Friendship Hospital-Affiliate to Capital Medical University, Beijing, PR China
4. Medical Research Center, Shandong Provincial Qianfoshan Hospital, Shandong University, Jinan, Shandong, PR China;