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. Center for Molecular Imaging and Translational Medicine, School of Public Health, Xiamen University, Xiamen 261005, China
3. Positron Emission Tomography Department, Warren Grant Magnuson Clinical Center, National Institutes of Health, Bethesda, Maryland 20892, United States
4. Department of Chemistry, Brown University, Providence, Rhode Island 02912, United States