1. Engineering
Research Center of Molecular-imaging and Neuro-imaging of Ministry
of Education, School of Life Science and Technology, Xidian University, Xi’an, Shaanxi 710126, China
2. Laboratory
of Molecular Imaging and Nanomedicine (LOMIN), National Institute of Biomedical Imaging and Bioengineering (NIBIB), National Institutes of Health (NIH), Bethesda, Maryland 20892, United States