“…Studies were located in the USA (24) [ 27 - 50 ], Australia (11) [ 51 - 61 ], UK (7) [ 62 - 68 ], Canada (3) [ 69 - 71 ], and one each from New Zealand [ 72 ] and Belgium [ 73 ]. Nearly all the studies were quantitative experimental studies in design, with twenty six randomised controlled trials, [ 4 , 27 , 28 , 32 - 34 , 36 - 38 , 42 , 43 , 46 , 47 , 49 , 52 , 54 , 56 , 58 , 62 - 67 , 70 ] two studies reporting methods only [ 28 , 35 ], three non-randomised controlled trials [ 31 , 41 , 73 ] and seventeen before-and-after studies [ 27 , 29 , 30 , 39 , 40 , 44 , 45 , 48 , 50 , 51 , 53 , 55 , 59 - 61 , 68 , 71 ] (two reporting methods only) [ 27 , 30 ]. We found only two qualitative studies reporting on recruitment approaches [ 57 , 69 ], with one paper reporting qualitative data as part of an RCT study [ 64 ].…”