... One study examined patients from two different countries: Scotland and Spain. 18 A further 24 studies assessed patients from the UK, 30,31,38,41,[43][44][45][46][47]51,56,57,[59][60][61][62]66,70,71,77,80,81 eight from Denmark, 35,39,48,69,74,76,79,82 seven from Spain, 19,30,34,40,49,63,65 five from the Netherlands, 50,[52][53][54]64 five from Sweden, 67,68,78,83,84 four from Australia, 27,28,37,72 two from China, 32,55 one from the USA, 73 one from Canada, 42 one from New Zealand, 58 one from Egypt, 75 one from Italy, 36 one from Malaysia 33 and one from Nigeria. 29 For further demographic information see Table 1. ...