1. Tsinghua Shenzhen International Graduate School Tsinghua University Shenzhen 518055 China
2. Harvard Medical School and Wellman Center for Photomedicine Massachusetts General Hospital Boston 02139 USA
3. Department of Diagnostic Imaging National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital Chinese Academy of Medical Sciences and Peking Union Medical College Beijing 100021 China
4. School of Materials Science and Engineering Tsinghua University Beijing 100084 China
5. CAS Key Laboratory of Molecular Imaging Institute of Automation and Chinese Academy of Sciences Beijing 100190 China