“…The majority of the research was conducted in the USA ( n = 23) 21 – 43 or the UK ( n = 12), 11 , 44 – 54 with fewer studies being conducted across the rest of the world: Australia ( n = 6), 55 – 60 Canada ( n = 3), 61 – 63 Taiwan ( n = 3), 64 – 66 Denmark ( n = 2), 67 , 68 Singapore ( n = 2), 69 , 70 Netherlands ( n = 2), 71 , 72 Germany ( n = 1), 73 New Zealand ( n = 1), 74 and Thailand ( n = 1). 75 Data collection methods primarily comprised interviews ( n = 35) 23 – 26 , 29 , 30 , 35 – 38 , 41 , 44 – 53 , 55 – 58 , 60 – 62 , 64 – 66 , 68 , 72 , 74 , 75 and focus groups ( n = 21). 11 , 22 , 28 , 31 , 33 , 34 , 39 , 40 , 42 , 43 , 45 – 47 , 58 , 59 , 63 , 67 , 69 – 71 , 73 A few alternative methods were also used: diary or journal data ( n = 2), …”