1. Department of Medical Imaging, Jinling Hospital, Medical School of Nanjing University, Nanjing, Jiangsu 210002, China.
2. Laboratory of Molecular Imaging and Nanomedicine, National Institute of Biomedical Imaging and Bioengineering, NIH, Bethesda, MD 20892, USA.
3. Department of Pharmaceutics, Center for Pharmaceutical Engineering and Sciences, Institute for Structural Biology, Drug Discovery and Development, School of Pharmacy; Massey Cancer Center; Virginia Commonwealth University, Richmond, VA, 23219, USA.