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Monitoring of timely and delayed vaccinations: A nation-wide registry-based study of Norwegian children aged

Delayed vaccinations increase the risk for vaccine preventable diseases (VPDs). Monitoring of delayed vaccinations by using a national immunisation registry has not been studied in countries recommending a twodose (3 and 5 months of age) primary series of e.g., pertussis vaccine. Surveillance/monitoring of all vaccinations may improve vaccination programmes functioning. | Monitoring of timely and delayed vaccinations: A nation-wide registry-based study of Norwegian children aged