Limited human-to-human transmission of avian influenza A(H7N9) virus, Shanghai, China, March to April 2013 Hu, J and Zhu, Y and Zhao, B and Li, J and Liu, L and Gu, K and Zhang, W and Su, H and Teng, Z and Tang, S and Yuan, Z and Feng, Z and Wu, F, Eurosurveillance, 19, 20838 (2014), https://doi.org/10.2807/1560-7917.ES2014.19.25.20838