“…Table 3 summarizes the characteristics of the pain measurement studies included in the review. We included 43 studies: 23 from the USA, 20,23,30,31,36,38,39,43,45,46,[48][49][50][51][52]56,59,62,[64][65][66][67]70 3 from Canada, 32,57,60 one from South America, 41 5 from A u s t r a l i a , 3 4 , 3 5 , 4 7 , 5 4 , 6 3 a n d 11 f r o m E urope. 33,37,40,42,44,53,55,58,61,68,69 Of the US studies, four enrolled exclusively military Veterans 20,48,52,65 and two enrolled both Veterans and non-Veterans.…”