“…Two studies were conducted in South America in Brazil (Coça et al, 2019; Scarpelli et al, 2008). There are 12 studies conducted in Asia, of which three studies in Japan(Sato et al, 2014; Tsuji et al, 2011; Wakimizu et al, 2011), three studies in Taiwan (Tsai et al, 2013; Wu et al, 2013, 2016), two studies in China (Li et al, 2010, 2013b), two studies in South Korea (Kim & Yi, 2013; Sohn et al, 2017), one in Indonesia (Sitaresmi et al, 2008) and one in Iran (Zahed & Koohi, 2020). Nine studies were conducted in Europe, of which three studies in the UK (Canning et al, 2014; D’Urso et al, 2018; Michel et al, 2010), two studies in Switzerland (Gianinazzi et al, 2013; Landolt et al, 2003), two studies in Italy (Adduci et al, 2012; Tremolada et al, 2016), one in the Netherlands (Gordijn et al, 2013), and one in Portugal (Martins et al, 2018).…”