1. Department of Biochemistry, School of Medicine, Nankai University, Tianjin 300071, China
2. Molecular Imaging Program at Stanford (MIPS), Canary Center at Stanford for Cancer Early Detection, Department of Radiology and Bio-X Program, School of Medicine, Stanford University, Stanford, CA 94305, USA
3. School of Health Sciences, Purdue University, 550 Stadium Mall Drive, West Lafayette, IN 47907, USA
4. Department of Nuclear Medicine, Nanjing First Hospital, Nanjing Medical University, Nanjing 210006, China