“…52–61 Almost half ( n = 18) of the studies were conducted in the US 28,29,32,33,36,39–42,44–48,50,59,62 followed by Australia ( n = 5) 27,53–55,58 and Canada ( n = 4). 38,57,60,63 The remaining studies were conducted in the UK, 52 Germany, 49 Ireland, 30 Belgium, 35 Netherlands, 57,61 Norway, 51 Japan, 31 and China. 16,43 Half of the included studies ( n = 19) were published between 2010 and 2013, 29,32,34,36,38,39,41,42,44–47,49,54,58–61 with the other half published from 2014 onwards.…”