1. Shaanxi Provincial Key Lab of Speech & Image Information Processing (SAIIP), School of Computer Science, Northwestern Polytechnical University, Xi’an 710072, China
2. Biomedical and Multimedia Information Technology (BMIT) Research Group, School of Information Technologies, The University of Sydney, Sydney, NSW 2006, Australia
3. Department of Molecular Imaging, Royal Prince Alfred Hospital, Sydney, NSW 2050, Australia
4. Sydney Medical School, The University of Sydney, Sydney, NSW 2006, Australia
5. Med-X Research Institute, Shanghai Jiao Tong University, Shanghai 200030, China