1. California NanoSystems Institute Crump Institute for Molecular Imaging Department of Molecular and Medical Pharmacology University of California, Los Angeles Los Angeles CA 90095 USA
2. Key Laboratory for Nano‐Bio Interface Suzhou Institute of Nano‐Tech and Nano‐Bionics University of Chinese Academy of Sciences Chinese Academy of Sciences Suzhou 215123 P. R. China
3. Department of Surgery University of California, Los Angeles Los Angeles CA 90095 USA
4. Department of Pathology Zhongshan Hospital Fudan University Shanghai 200032 P. R. China
5. Department of Pathology Shanghai Medical College Fudan University Shanghai 200032 P. R. China
6. Department of Pediatrics David Geffen School of Medicine Eli and Edythe Broad Center of Regenerative Medicine and Stem Cell Research and Children's Discovery and Innovation Institute University of California, Los Angeles Los Angeles CA 90095 USA
7. Smart Organic Materials Laboratory Institute of Chemistry Academia Sinica Nankang Taipei 115 Taiwan
8. Research Center for Applied Sciences Academia Sinica Nankang Taipei 115 Taiwan
9. Departments of Oncology and Pediatrics Georgetown University Washington DC 20057 USA
10. California NanoSystems Institute Departments of Chemistry and Biochemistry and of Materials Science and Engineering University of California, Los Angeles Los Angeles CA 90095 USA