title: [Methodologic aspects of the report on pandemic A (H1N1) influenza 2009].
mesh_terms: D002648:Child; D004196:Disease Outbreaks; D006801:Humans; D053118:Influenza A Virus, H1N1 Subtype; D007251:Influenza, Human / Q000453:epidemiology*; D017410:Practice Guidelines as Topic