Zhou, Lei, Ruiqi Ren, Lei Yang, Changjun Bao, Jiabing Wu, Dayan Wang, Chao Li, et al. 2017. “Sudden Increase in Human Infection With Avian Influenza A(H7N9) Virus in China, September-December 2016”. Western Pacific Surveillance and Response 8 (1). https://doi.org/10.5365/wpsar.2017.8.1.001.