Start typing to search across the full knowledge system.
Canonical Source · peer reviewed study
This page documents how this source is reused across Claim by Claim. A source can support, challenge, qualify or contextualize different claims; appearing here does not imply endorsement of every linked proposition.
Evidence context
Evidence roles describe what this source helps establish inside each Investigation. They are local to that use, not permanent labels attached to the publication itself.
Investigation
A Norwegian pragmatic randomized trial found fewer self-reported respiratory-infection symptoms among adults assigned to surgical masks in public spaces.
The primary endpoint was broader than laboratory-confirmed SARS-CoV-2 infection.
Subject families