“…This literature review finally examined 20 articles, of which 19 were RCTs and 1 was an RPT. Regarding international location, 85% of the studies were conducted in Europe [Norway ( 10 – 15 ): 6, Denmark ( 16 – 20 ): 5, Netherlands ( 21 ): 1, Sweden ( 22 , 23 ): 2, UK ( 24 , 25 ): 2, Portugal ( 26 ): 1], 10% were conducted in Asia [China ( 27 ): 1, Hong Kong ( 28 ): 1], and 5% were conducted in North America [USA ( 9 ): 1]. For the intervention types, seven studies provided type I intervention, whereas 13 studies provided type II intervention.…”