1. CAS Key Laboratory for Biomedical Effects of Nanomaterials & Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, and National Center for Nanosciences and Technology of China, Beijing 100190, China
2. State Key Laboratory of Magnetice Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China
3. Research Center for Cancer Nanotechnology, Tianjin Cancer Hospital and Chinese Academy of Sciences, Tianjin 300060, China