1. The School of Physics and Engineering, Sun Yat-sen University, Guangzhou, People's Republic of China.
2. State Key Laboratory of Oncology in South China, Guangzhou, People's Republic of China.
3. Radiation Physics Unit, Cancer Center, Sun Yat-sen University, Guangzhou, People's Republic of China.
4. Cancer Center, St. Teresa's Hospital, Kowloon, People's Republic of China.
5. Department of Nuclear Medicine, Cancer Center, Sun Yat-sen University, Guangzhou, People's Republic of China.