The paper which we discuss in the interview is available open access here
Taken from: https://pbrainmd.wordpress.com/2015/10/15/1335/
To understand more about hierachy of evidence and how a systematic review fits into this please have a look at these resources available from the Cochrane group.
http://consumers.cochrane.org/levels-evidence
http://training.cochrane.org/path/grade-approach-evaluating-quality-evidence-pathway
The CASP checklist can be used for assessing the quality of a meta-analysis.
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