Input data for utilities.

aNo difference in input values between healthy and at-risk populations.
bDuration 7.5 days without antiviral treatment, 5.0 days with antiviral treatment.
cDuration 5.4 days. Outpatient-treated complications assumed to have the same duration as hospitalised complications, and the same disutility as influenza. Disutilities and durations are identical for all types of complications.