1. Department of Radiology and BRIC, University of North Carolina at Chapel Hill, USA
2. Department of Radiology, Beijing Youan Hospital, Capital Medical University, China
3. Department of Biostatistics and BRIC, University of North Carolina at Chapel Hill, USA
4. Department of Radiology, Beijing Youan Hospital, Capital Medical University, Beijing, China
5. School of Computer Science and Technology, Shandong Jianzhu University, China
6. Department of Radiology and BRIC, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA