“…A total of 74 studies were published in peer-reviewed journals [ 10 , 21 – 28 , 30 – 99 ]; nine more were retrieved from doctoral theses [ 100 – 108 ] and three others from book chapters reviewed by editorial committees [ 29 , 109 , 110 ]. Over half were published after 2005 (n = 50) [ 10 , 21 – 23 , 25 – 39 , 44 , 46 – 48 , 51 , 53 , 55 – 58 , 60 – 62 , 64 – 66 , 68 , 69 , 71 , 74 , 77 , 78 , 80 , 81 , 84 – 86 , 88 , 90 – 92 , 96 , 98 , 99 , 106 ]. Over three quarters of independent studies were conducted in the USA (n = 48) [ 21 , 24 , 31 , 33 , 36 – 38 , 40 – 43 , 47 ,…”