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Key: CVD=Cardiovascular diseases; RCT=Randomised controlled trial; SR=Systematic Review.
*Of the 27 included publications: a) CVD, SR=9, RCT=3; b) Cancer, SR=6; and c) Diabetes, SR=7, RCT=2. **One paper was identified from assessment of reference lists of excluded papers, this had been excluded at abstract sift but was not considered relevant until reading the paper in full.
