title: Letter: Influenza and ventricular septal defect.
mesh_terms: D004196:Disease Outbreaks; D006345:Heart Septal Defects, Ventricular / Q000209:etiology*; D006801:Humans; D007251:Influenza, Human / Q000150:complications* / Q000453:epidemiology; D012621:Seasons; D013997:Time Factors