[Wu, Yimou; Zhao, Feijun; Zeng, Tiebing] Univ South China, Pathogen Biol Inst, Hengyang City, Hunan, Peoples R China.
Centers Dis Control Hunan Prov, Changsha, Hunan, Peoples R China.
[Liu, Shuangquan] Cent S Univ, Dept Anat & Neurobiol, Xiangya Sch Med, Changsha, Hunan, Peoples R China.
[Liu, Shuangquan; Cao, Xunyu] Univ South China, Affiliated Hosp 1, Hengyang, Hunan, Peoples R China.
[Zhang, Xiaohong] Univ South China, Dept Histol & Embryol, Sch Med, Hengyang, Hunan, Peoples R China.