“…Using the CASP [ 25 ], we determined that 21 [ 20 , 28 – 30 , 32 , 33 , 35 , 37 , 39 – 42 , 44 – 46 , 49 , 51 – 54 , 56 ] of the studies were methodologically sound and had ‘no or very minor concerns’. In seven studies [ 31 , 34 , 36 , 48 , 50 , 51 , 55 ] only minor concerns were found.…”