“…All 21 studies included in the review were published in English between 2002 and 2019. They were conducted in the following countries: the United States ( Pisoni and Cleary, 2003 ; Conway et al, 2011a , b ; Stiles et al, 2012 ; Beer et al, 2014 ; Bharadwaj et al, 2015 ; Meinzen-Derr et al, 2018 ; Davidson et al, 2019 ; McCreery et al, 2019 ), the United Kingdom ( Figueras et al, 2008 ; Edwards and Anderson, 2014 ; Botting et al, 2017 ), Italy ( Bubbico et al, 2007 ; Colletti et al, 2011 ), Australia ( Dawson et al, 2002 ), Saudi Arabia ( Hassan et al, 2014 ), South Korea ( Lee et al, 2012 ), Denmark ( Udholm et al, 2017 ), the Netherlands ( de Hoog et al, 2016 ), Iran ( Soleymani et al, 2016 ), and Taiwan ( Lo and Chen, 2017 ).…”