Virus-host interactions and the unusual age and sex distribution of human cases of influenza A(H7N9) in China, April 2013 
Skowronski, D M and Janjua, N Z and Kwindt, T L and De Serres, G, Eurosurveillance, 18, 20465 (2013), https://doi.org/10.2807/ese.18.17.20465-en