1. Department of Public Health Laboratory Sciences, School of Public Health, Hengyang Medical School, University of South China, Hengyang, Hunan, 421001, People's Republic of China
2. Yueyang County Center for Disease Control and Prevention, Yueyang, Hunan, 414100, People's Republic of China
3. Yongding District Center for Disease Control and Prevention, Zhangjiajie, Hunan, 427000, People's Republic of China