Higher all-cause mortality in children during autumn 2009 compared with the three previous years: pooled results from eight European countries
Mortality attributable to 9 common infections: significant effect of influenza A, respiratory syncytial virus, influenza B, norovirus, and parainfluenza in elderly persons
Comparing pandemic to seasonal influenza mortality: moderate impact overall but high mortality in young children
Detection of excess influenza severity: associating respiratory hospitalization and mortality data with reports of influenza-like illness by primary care physicians