“…Countries of publication for RCTs included (in descending order): the USA (n=4), 17,18,20,43 Australia (n=3), 21,22,26 Hong Kong (n=2), 9,25 the UK (n=2), 24,44 the Netherlands (n=1), 42 and Japan (n=1). 23 Countries of publication for non-RCTs included (in descending order): the USA (n=5), 28,31,32,37,41 Australia (n=4), 27,29,30,36 the UK (n=2), 34,35 India (n=1), 33 Hong Kong (n=1), 38 Iran (n=1), 39 and China (n=1). 40 The methodological quality of the RCTs was (in descending order) high in nine, 9,17,18,20,22,23,25,26,42 fair in two, 21,43 and low in two (Table SII, online supporting information).…”