1. Institute of Nuclear Physics and Chemistry (INPC), China Academy of Engineering Physics (CAEP), Mianyang 621999, P. R. China
2. Key Laboratory of Nuclear Medicine and Molecular Imaging of Sichuan Province, Mianyang 621999, P. R. China
3. Collaborative Innovation Center of Radiation Medicine of Jiangsu, Higher Education Institutions, Suzhou 215123, P. R. China
4. National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing 102206, P. R. China
5. PLA Center for Disease Control and Prevention, Beijing 100071, P. R. China
6. Department of Nuclear Medicine, The Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan 646000, China