[1] Porta M. A dictionary of epidemiology. 6th ed. New York: Oxford University Press. 2014; p. 274.
[2] Liu J, Ding F, Wu Y, Jing WZ, Yan WX, Qin CY, et al. Trends of SARS-CoV-2 infection in sentinel community-based surveillance after the optimization of prevention and control measures — China, December 2022–January 2023. China CDC Wkly 2023;5(7):159 − 64. http://dx.doi.org/10.46234/ccdcw2023.028.
[3] Jing WZ, Ding F, Zhang YP, Shi GQ, Liu J, Wu Y, et al. Trends of SARS-CoV-2 infection in rural area in sentinel community-based surveillance — China, December 2022 to January 2023. China CDC Wkly 2023;5(11):241 − 7. http://dx.doi.org/10.46234/ccdcw2023.044.
[4] Leung K, Lau EHY, Wong CKH, Leung GM, Wu JT. Estimating the transmission dynamics of SARS-CoV-2 Omicron BF.7 in Beijing after adjustment of the zero-COVID policy in November–December 2022. Nat Med 2023;29(3):579-82. http://dx.doi.org/10.1038/s41591-023-02212-y.
[5] Liu J, Li WD, Yao HY, Liu JJ. Proactive health: an imperative to achieve the goal of healthy China. China CDC Wkly 2022;4(36):799 − 801. http://dx.doi.org/10.46234/ccdcw2022.156.