[Cost factors of influenza].
Heinzl
S
S
D003365:Costs and Cost Analysis; D005858:Germany / Q000453:epidemiology; D006801:Humans; D015994:Incidence; D007251:Influenza, Human / Q000191:economics* / Q000453:epidemiology*; D013557:Switzerland / Q000453:epidemiology; D014481:United States / Q000453:epidemiology