“…All 52 studies were classified using the MMAT as follows: two Quantitative Randomised [ 31 , 48 ] eight Quantitative Non-randomised [ 36 , 42 , 45 , 48 , 50 , 55 , 64 , 74 , 79 ], fourteen Quantitative Descriptive [ 37 , 43 , 49 , 51 – 54 , 57 , 61 , 62 , 70 , 72 , 73 , 76 ], nine Qualitative [ 33 – 35 , 39 , 41 , 56 , 58 , 59 , 66 ], and five Mixed Methods [ 30 , 44 , 60 , 63 , 71 ]. Fourteen studies (all grey literature) could not be classified using MMAT as they used a selection of quality improvement designs including four which used PDSA cycles [ 38 , 40 , 65 , 69 ], seven used other QI methods [ 32 , 46 , 47 , 67 , 68 , 77 , 81 ] and in three studies the methodology was unclear [ 76 , 78 , 80 ].…”