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Norway
Otitis Media
Acute Disease
Respiratory Tract Infections
Tonsillitis
Questionnaires
Infants
Recurrence
Prevalence
Incidence
Cross-Sectional Studies
Risk Factors
Cohort Studies
Retrospective Studies
Registries
Odds Ratio
Adenoidectomy
Middle Ear Ventilation
Otorhinolaryngologic Surgical Procedures
Ambulatory Surgical Procedures
Co-Publications
15
12
11
9
7
5
4
3
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