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Watch this 5-minute video for help with identifying different levels of evidence.
Checklists from Critical Appraisal Skills Programme [CASP]. Feature questions to ask and things to look for when identifying various types of literature and levels of evidence. All CASP Checklists are licensed under Creative Commons Attribution-Non-Commercial-ShareAlike licenses. For more information visit: https://creativecommons.org/licenses/by-nc-sa/4.0/