“…The 36 studies included in this review were published between 1998 and 2015. Twelve were undertaken in the USA [ 14 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 ], six in Canada [ 13 , 33 , 34 , 35 , 36 , 37 ], two in the UK [ 38 , 39 ], eight in Australia [ 12 , 40 , 41 , 42 , 43 , 44 , 45 , 46 ], two in New-Zealand [ 47 , 48 ], and one each in Ireland [ 49 ], Brazil [ 50 ], Sweden [ 51 ], Belgium [ 52 ] and Iceland [ 53 ], with one study having recruited from both Canada and the USA [ 54 ] ( Appendix A ). Sample sizes varied from eight to 396 participants with four studies not specifying a sample size.…”