“…Distribution of studies regarding publication year was as follows: 8 studies published in 2013 [ 17 , 22 – 24 , 27 , 28 , 41 , 42 ], 15 in 2014 [ 14 – 16 , 19 , 21 , 30 , 32 , 33 , 35 , 36 , 38 , 40 , 43 , 44 , 47 ], 10 in 2015 [ 13 , 18 , 25 , 26 , 29 , 31 , 34 , 45 , 46 , 48 ] and 3 in 2016 [ 20 , 37 , 39 ]. The majority of the publications analysed data from European countries (28; 78%), both North and Central (12) (Norway [ 13 – 15 , 19 , 20 ], Denmark [ 45 ], Sweden [ 35 ], the Netherlands [ 17 , 32 , 34 , 40 ] and Austria [ 41 ]) and South Europe (15) (France [ 22 , 36 ], Italy [ 18 , 24 , 29 , 37 , 43 ], Spain [ 23 , 27 , 28 , 31 , 38 , 39 , 46 ] and Portugal [ 33 ]) and 1 from the UK [ 26 ]. Seven papers (19%) explored this issue in North America (2 from USA [ 30 , 34 ] and 5 from Canada [ ...…”