1. Department of Medical Ultrasonics, Division of Interventional Ultrasound, The First Affiliated Hospital, Sun Yat-Sen University, 58 Zhong Shan Rd 2, Yuexiu, Guangzhou 510080, People's Republic of China.
2. Department of Radiology, David Geffen School of Medicine at UCLA, Los Angeles, CA.
3. Department of Radiology, Cathay General Hospital, Taipei, Taiwan.
4. School of Medicine, Fu Jen Catholic University, New Taipei City, Taiwan.
5. Department of Liver Surgery, The First Affiliated Hospital, Sun Yat-Sen University, Guangzhou, People's Republic of China.