The Lower Serum Immunoglobulin G2 Level in Severe Cases than in Mild Cases of Pandemic H1N1 2009 Influenza Is Associated with Cytokine DysregulationJasper Fuk‐Woo Chan, Kwok‐Yung Yuen, Ivan Fan‐Ngai Hung et al.|Clinical and Vaccine Immunology|2010Cited by 51