Clinical severity of human infections with avian influenza A(H7N9) virus, China, 2013/14 Feng, L and Wu, J T and Liu, X and Yang, P and Tsang, T K and Jiang, H and Wu, P and Yang, J and Fang, V J and Qin, Y and Lau, E H and Li, M and Zheng, J and Peng, Z and Xie, Y and Wang, Q and Li, Z and Leung, G M and Gao, G F and Yu, H and Cowling, B J, Eurosurveillance, 19, 20984 (2014), https://doi.org/10.2807/1560-7917.ES2014.19.49.20984