1. CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety; Institute of High Energy Physics; Chinese Academy of Sciences; Beijing 100049 China
2. College of Materials Science and Optoelectronic Technology; University of Chinese Academy of Sciences; Beijing 100049 China
3. Department of Medical Imaging; First Hospital of Shanxi Medical University; Taiyuan Shanxi 030001 China
4. CAS Center for Excellence in Nanoscience; National Center for Nanoscience and Technology of China; Chinese Academy of Sciences; Beijing 100190 China