1. Department of Radiology, The Sixth Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
2. Department of Radiology, The Third Affiliated Hospital of Sun Yat-sen University, Guangzhou, China
3. Department of Radiology, The fifth Affiliated Hospital of Sun Yat-sen University, Zhuhai, China
4. Department of Ultrasonic, The Third Affiliated Hospital of Sun Yat-sen Univerysity, Guangzhou, China