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80 and over
1
Adolescent
1
Adult
1
Aged
1
Child
1
Comparative Study
1
Female
1
H1N1 Subtype
1
Hospitalization
1
Human
1
Humans
1
Infant
1
Influenza
1
Influenza A Virus
1
Influenza Vaccines
1
Intensive Care Units
1
Journal Article
Male
1
Mass Vaccination
1
Middle Aged
1
Pandemics
1
Pregnancy
1
Preschool
1
Prevalence
1
Risk Factors
1
Scandinavian and Nordic Countries
1
Seasons
1
Severity of Illness Index
1
Survival Rate
1
Treatment Outcome
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