1. Department of Nuclear Medicine, Peking University First Hospital, Beijing, China 100034
2. Departments of Radiology and Medical Physics, University of Wisconsin—Madison, Madison, Wisconsin 53705, United States
3. Department of Biomedical Engineering, University of Wisconsin—Madison, Madison, Wisconsin 53705, United States
4. Department of Medical Molecular Biology, Beijing Institute of Biotechnology, Beijing, China 100850
5. Department of Oncology, Harbin Medical University Affiliated Cancer Hospital, Harbin, China 150081
6. Department of Nuclear Medicine, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China 430022