1. Department of Diagnostic Radiology, Hunan Cancer Hospital, Changsha 410013, Hunan, P.R. China
2. Department of Pathology, Hunan Cancer Hospital, Changsha 410013, Hunan, P.R. China
3. Department of Ultrasound, Hunan Cancer Hospital, Changsha 410013, Hunan, P.R.China
4. Department of Medical Service, Hunan Cancer Hospital, Changsha 410013, Hunan, P.R. China