1. School of Information Sciences and Technology Northwest University Xi'an People's Republic of China
2. Center for Biomedical Imaging Research, Department of Biomedical Engineering Tsinghua University Beijing People's Republic of China
3. Department of Medical Imaging Henan Provincial People's Hospital & the People's Hospital of Zhengzhou University Zhengzhou People's Republic of China
4. Department of Medical Imaging Weifang Medical University Weifang People's Republic of China