1. Department of Computer Science City University of Hong Kong Kowloon Tong Hong Kong SAR
2. BioMedical Machine Learning Lab, Graduate School of Biomedical Engineering University of New South Wales Sydney 2052 Australia
3. Molecular Pathology Unit, Center for Cancer Research, Massachusetts General Hospital Department of Pathology Harvard Medical School Boston MA 02129 USA
4. Department of Computer Science The University of Hong Kong Pok Fu Lam Hong Kong SAR
5. Department of Medical Biophysics, Faculty of Medicine University of Toronto Toronto Ontario M5G1L7 Canada
6. School of Artificial Intelligence Jilin University Changchun 130012 China