# Bias in observational study designs: case-control studies

> Research article (BMJ, 2015) · cited 33× · AI/ML

**Wikidata**: [openalex:W2078796967](https://www.wikidata.org/wiki/openalex:W2078796967)  
**Source**: https://4ort.xyz/entity/bias-in-observational-study-designs-case-control-studies