1. Department of Radiology and Biomedical Imaging; University of California at San Francisco; San Francisco CA USA
2. Laboratory of Biomedical Imaging and Signal Processing; The University of Hong Kong; Pokfulam Hong Kong China
3. Department of Electrical and Electronic Engineering; The University of Hong Kong; Pokfulam Hong Kong China
4. State Key Laboratory of Pharmaceutical Biotechnology; The University of Hong Kong; Hong Kong China