1. Laboratory
of Molecular Imaging and Nanomedicine (LOMIN), National Institute of Biomedical Imaging and Bioengineering (NIBIB), National Institutes of Health, Bethesda, Maryland 20892, United States
2. State
Key Laboratory for Powder Metallurgy, Central South University, Changsha, Hunan 410083, China
3. Department
of Radiology, The Third Xiangya Hospital, Central South University, Changsha, Hunan 410013, China
4. Center
for Molecular Imaging and Translational Medicine, State Key Laboratory
of Molecular Vaccinology and Molecular Diagnostics, School of Public
Health, Xiamen University, Xiamen 361005, China