[Yang, F; Yang, Yue; Yang, Fei; Yang, Mingjie; Zhan, Chunhua] Univ South China, Sch Publ Hlth, Hengyang Med Sch, Hengyang, Peoples R China.
[Zheng, Shuilin] Changsha Ctr Dis Control & Prevent, Changsha, Peoples R China.
[Yang, Yue; Zeng, Wen] Cent Hosp Shaoyang, Dept Publ Hlth, Shaoyang, Peoples R China.
[Yang, F; Yang, Fei] Univ South China, Nanhua Hosp, Hengyang Med Sch, Nucl Med Dept, Hengyang, Peoples R China.