1. Molecular Imaging Program at Stanford Departments of Radiology and Chemistry School of Medicine Stanford University Stanford CA 94305 USA
2. Institute of Nanophotonics Jinan University Guangzhou 511443 China
3. Department of Bioengineering Stanford University Stanford CA 94305 USA
4. Department of Materials Science and Engineering City University of Hong Kong Hong Kong SAR China
5. College of Materials Science and Engineering Shenzhen University Shenzhen 51860 China
6. Departments of Physics and Molecular and Cellular Physiology Stanford University Stanford CA 94305 USA