Critical Appraisal Skills Programme (CASP) CASP Systematic Review Checklist. Available from URL: http://media.wix.com/ugd/dded87_a02ff2e3445f4952992d5a96ca562576.pdf

Centre for Evidence Based Medicine (CEBM) Systematic Review: Are the results of the review valid? Available from: http://www.cebm.net/wp-content/uploads/2014/06/SYSTEMATIC-REVIEW.docx

Scottish Intercollegiate Guidelines Network (SIGN). Methodology Checklist 1: Systematic Reviews and Meta-analyses. Edinburgh: SIGN. [cited 12 Apr 2016]. Available from URL:  http://www.sign.ac.uk/methodology/checklists/20150417SRchecklist.doc Notes: http://www.sign.ac.uk/methodology/checklists/20150417SRnotes.doc