1. Department of Radiology, Shandong Provincial Qianfoshan Hospital, Jinan, China.
2. Department of Electrical and Computer Engineering, University of Saskatchewan, Saskatoon, Canada.
3. Department of Radiology, Research Institute of Clinical Medicine, Biomedical Research Institute of Jeonbuk National University Hospital, Jeonbuk National University Medical School, Institute of Medical Science, Jeonju, Korea.