“…Fifteen studies were included ( Figure 1 ) ( 26–39 , 45 ). There were six observational studies ( 27 , 30 , 31 , 33 , 34 , 39 ), four pre−/post-intervention studies ( 26 , 32 , 38 , 45 ), two qualitative studies ( 35 , 37 ), and three modelling studies ( 27 , 28 , 34 ). Eleven of the included studies were from the US ( 27–34 , 37 , 38 , 45 ) and three from the UK ( 35 , 36 , 39 ).…”