Human infection with avian influenza A(H7N9) virus re-emerges in China in winter 2013 Chen, E and Chen, Y and Fu, L and Chen, Z and Gong, Z and Mao, H and Wang, D and Ni, M Y and Wu, P and Yu, Z and He, T and Li, Z and Gao, J and Liu, S and Shu, Y and Cowling, B J and Xia, S and Yu, H, Eurosurveillance, 18, 20616 (2013), https://doi.org/10.2807/1560-7917.ES2013.18.43.20616