# Effectiveness of influenza vaccination in the elderly: a population-based case-crossover study

> Research article (BMJ Open, 2022) · cited 12× · AI/ML

**Wikidata**: [openalex:W4213198429](https://www.wikidata.org/wiki/openalex:W4213198429)  
**Source**: https://4ort.xyz/entity/effectiveness-of-influenza-vaccination-in-the-elderly-a-population-based-case-crossover-study