“…Nine studies were published in 2018 or later [ 23 – 25 , 30 , 31 , 33 , 36 , 42 , 43 ]. Four studies were carried out in the UK [ 29 , 37 , 38 , 44 ], three studies in Thailand [ 23 , 28 , 35 ], three in South Korea [ 24 , 25 , 33 ], two in USA [ 27 , 31 ], two in Sweden [ 43 , 45 ], two in India [ 39 , 40 ], one in Japan [ 26 ], one in Australia [ 34 ], one in Taiwan [ 36 ], one in China [ 32 ], One in Iran [ 30 ], one in Germany [ 42 ], and one in Canada [ 41 ].…”