1. Department of Radiology; First Affiliated Hospital of Sun Yat-Sen University; Guangzhou Guangdong P.R. China
2. Ultrosounic Department; First Affiliated Hospital of Sun Yat-Sen University; Guangzhou Guangdong P.R. China
3. Department of Biomedical Engineering, Cancer Biology, Radiology; Wake Forest School of Medicine; Winston-Salam North Carolina USA