How to read this infographic

Legend

Stronger evidence Weaker evidence

Publications

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These studies include meta-analyses, systematic reviews, and rigorously designed studies that can show causality. Try using the drop-down menu "Select type of evidence" or read about different types of evidence here
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These studies include individual case studies that can only show correlation, not causation. Try using the drop-down menu "Select type of evidence" or read about different types of evidence here
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