“…Of the 64 included evaluation studies, 61% ( n = 39) provided a clear definition for sustainability [ 19 – 21 , 27 – 36 , 39 , 42 – 50 , 53 , 54 , 56 , 58 , 60 – 62 , 64 , 65 , 67 , 71 , 73 , 74 , 76 , 77 , 80 , 81 ] and 39% ( n = 25) did not explicitly define sustainability [ 22 – 26 , 30 , 37 , 38 , 40 , 41 , 51 , 52 , 55 , 57 , 59 , 63 , 66 , 68 – 70 , 72 , 75 , 78 , 79 , 82 ]. Of the 39 studies with a clear definition, 66% ( n = 26) drew upon one empirical source to define sustainability [ 20 , 28 , 29 , 31 – 36 , 39 , 42 – 44 , 46 , 47 , 50 , 53 , 54 , 56 , 60 , 64 , 65 , 73 , 74 , 77 , 80 ], 26% ( n = 10) drew upon multiple sources [ <...…”