“…the most common data collection methods used were interviews ( n = 20 of 38 studies) [ 23 , 24 , 26 , 27 , 33 – 38 , 42 , 44 – 46 , 49 , 51 , 54 , 58 – 60 ], surveys ( n = 17) [ 27 , 28 , 30 – 32 , 34 , 40 , 42 , 43 , 46 , 47 , 50 – 52 , 56 , 57 , 59 ] and case studies involving multiple methods ( n = 4) [ 54 , 56 , 59 , 60 ] (there were 12 articles studying only one case [ 35 , 43 – 46 , 48 , 54 , 56 – 60 ] and only 4 of them used more than one data collection method).…”