# Nationwide Utilization of Danish Government Electronic Letter System for Increasing InFLUenza Vaccine Uptake

> **NCT05542004** · NA · COMPLETED · sponsor: **Tor Biering-Sørensen** · enrollment: 964870 (actual)

## Conditions studied

- Influenza
- Behavior and Behavior Mechanisms

## Interventions

- **BEHAVIORAL:** Behavioral Economic Principles

## Key facts

- **NCT ID:** NCT05542004
- **Lead sponsor:** Tor Biering-Sørensen
- **Sponsor class:** OTHER
- **Phase:** NA
- **Study type:** INTERVENTIONAL
- **Status:** COMPLETED
- **Start date:** 2022-09-16
- **Primary completion:** 2023-01-01
- **Final completion:** 2023-05-31
- **Target enrollment:** 964870 (ACTUAL)
- **Last updated:** 2024-10-10

## Collaborators

- [object Object]
- [object Object]

## Primary source

ClinicalTrials.gov registry: https://clinicaltrials.gov/study/NCT05542004

## Citation

> US National Library of Medicine, ClinicalTrials.gov registration NCT05542004, "Nationwide Utilization of Danish Government Electronic Letter System for Increasing InFLUenza Vaccine Uptake". Retrieved via AI Analytics 2026-06-01 from https://api.ai-analytics.org/clinical/NCT05542004. Licensed CC0.

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