Fig. 1

ROSES flow chart detailing the quantity of studies at each stage of the screening process. Created in accordance with ROSES Reporting Standards for Systematic Evidence Synthesis (Haddaway et al. 2018). ‘Records identified from searching other sources’ refers to the search conducted using google scholar which was not included within the primary searches because it is not a bibliographic database. The search for grey literature using AHDB and Gov.uk returned no relevant studies