“…Altogether seven original and relevant studies were detected. Two studies were randomized controlled trials (Bubbico et al, 2019;Wong et al, 2019) and five were experimental studies (Gruneverg and Pascoe, 1996;Kliesch et al, 2017;Ware et al, 2017;Pfenninger and Polz, 2018;Valis et al, 2019). Most of them originated in Europe: Austria, Czechia, France, Great Britain, Italy, and Switzerland (Gruneverg and Pascoe, 1996;Kliesch et al, 2017;Ware et al, 2017;Pfenninger and Polz, 2018;Bubbico et al, 2019;Valis et al, 2019) and one (Wong et al, 2019) was a joint research of China and Australia.…”