“…Twenty-three (44.2%) of the 52 articles were conducted in the USA (20, 24, 45, 46, 49, 54, 57, 61, 62, 65, 66, 68/69, 71, 74–77, 79, 84–87, 90), four (7.7%) in Australia, 18 22 25 44 three (5.8%) in Turkey, 60 72 73 two (3.8%) in Japan, 50 59 two (3.8%) in Canada, 62 67 two (3.8%) in the Netherlands [53, 88/89], two (3.8%) in Belgium, 43 80 two (3.8%) in Germany 55 70 and one (1.9%) each in England, 42 Ireland, 47 UK, 48 Denmark, 51 Switzerland, 52 Sweden, 56 China, 58 Korea, 64 Portugal, 78 Ireland, 81 Spain 82 and Iran. 83 A variety of study designs were used including: randomised controlled trials (RCTs) (n=19) (20, 47, 53, 57, 59–63, 65, 67, 71–74, 82, 83, 86, 88/89), non-controlled before and after (n=13), 22 24 42–45 55 64 75 78–80 85 cross-over (n=8), 25 46 48 51 54 58 77 87 non-RCTs (n=3), 49 52 70 cross-sectional (n=3), 76 81 90 case series (n=2), 50 66 mixed methods (n=2) (18, 68/69), controlled before-and-after (n=1) 56 and grounded theory (n=1).…”