1. College of Computer Science, Zhejiang University, Hangzhou, China
2. Department of Radiology, Shanghai Chest Hospital, Shanghai Jiao Tong University, Shanghai, China
3. College of Computer and Information Engineering, Tianjin Normal University, Tianjin, China
4. Department of Computer Science, La Trobe University, Melbourne, VIC, Australia
5. Cyberspace Institute of Advanced Technology, Guangzhou University, Guangzhou, China
6. National Laboratory of Pattern Recognition (NLPR), Institute of Automatic Chinese Academy of Sciences, Beijing, China