“…Most of the publications present European data ( 5 , 11 – 13 , 19 , 22 – 28 , 35 , 42 , 43 , 45 – 48 , 50 – 52 , 55 – 58 , 61 ) of which the majority were from the UK ( 11 – 13 , 19 , 22 – 24 , 26 – 28 , 43 , 45 – 47 , 49 – 51 , 55 , 56 , 58 , 61 ). Eight of the selected papers were from lower or middle income countries ( 18 , 20 , 21 , 30 , 31 , 33 , 34 , 36 ), seven from the USA ( 32 , 37 – 39 , 41 , 54 , 60 ), three from Canada ( 40 , 44 , 53 ) and one from Australia ( 59 ).…”