1. Department of Computer Science and Technology, Xiamen University, Xiamen, China
2. Department of Computer Science, University College London, London, U.K.
3. Department of Radiology, Brigham and Women’s Hospital, Harvard University, Boston, MA, USA
4. School of Computing, University of Leeds, Leeds, U.K.
5. Department of Computer Science, Johns Hopkins University, Baltimore, MD, USA
6. Robarts Research Institute Western University, London, Canada