1. Department of Medical Imaging, Second Affiliated Hospital, Shantou University Medical College, Shantou, Guangdong 515000, P. R. China
2. Department of Medical Imaging, Seventh Affiliated Hospital, Sun Yat-sen University, Shenzhen, Guangdong 518000, P. R. China
3. Department of Ultrasound, First Affiliated Hospital, Shantou University Medical College, Shantou, Guangdong 515000, P. R. China
4. Provincial Key Laboratory for Breast Cancer Diagnosis and Treatment, Guangdong Province, Shantou, Guangdong 515041, P. R. China
5. Joint Department of Medical Imaging and the Functional Neuroimaging Laboratory (D.J.M.), University Health Network, Toronto M2J4A6, Canada
6. Department of Radiology, The Second Affiliated Hospital of Xiamen Medical College, Xiamen, Fujian 361023, P. R. China