# Opium use reporting error in case-control studies: neighborhood controls versus hospital visitor controls

> Research article (Medical Journal of the Islamic Republic of Iran, 2021) · cited 11× · AI/ML

**Wikidata**: [openalex:W3116661656](https://www.wikidata.org/wiki/openalex:W3116661656)  
**Source**: https://4ort.xyz/entity/opium-use-reporting-error-in-case-control-studies-neighborhood-controls-versus-hospital-visitor-controls