“…Twelve studies were carried out in the United States (48, 49,52,54,55,56,63,64,66,72,74,75), eleven in Australia (45,47,53,57,60,61,68,69,71,73,76), two in Netherlands (59,62), one in China (67), one in Iran (50), one in Korea (65), one in Portugal (58), one in Sri Lanka (70), one in Taiwan (46) and one in the United Kingdom (51). Only four studies (12.5%) were conducted between 2000-2010 (47,55,56,63); the others were conducted between years 2011-2020, among which 21 studies were conducted within the last ve years (2016-2020) at the time of conducting this review.…”