Spatial and temporal analysis of human infection with avian influenza A(H7N9) virus in China, 2013 Liu, W and Yang, K and Qi, X and Xu, K and Ji, H and Ai, J and Ge, A and Wu, Y and Li, Y and Dai, Q and Liang, Q and Bao, C and Bergquist, R and Tang, F and Zhu, Y, Eurosurveillance, 18, 20640 (2013), https://doi.org/10.2807/1560-7917.ES2013.18.47.20640