1. Key Laboratory of Nuclear Analysis Techniques, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, People's Republic of China.
2. Graduate School of the Chinese Academy of Sciences, Beijing, People's Republic of China.
3. Department of Radiology, Xuanwu Hospital, Capital University of Medical Sciences, Beijing, People's Republic of China.
4. General Hospital of Chinese People's Armed Police Forces, Beijing 100039, People's Republic of China.
5. Harvard College, Cambridge, MA.
6. Deparment of Physics, Zhejiang University, Hangzhou, People's Republic of China.