“…The authors' countries were obtained in order to verify the origin of the reviews. Seven of the authors were from the United States [6,[18][19][20][21][22][23][24] were from the United Kingdon [5,[25][26][27][28][29][30] were from Australia [3,5,[31][32][33][34] were from Canada [2,3,35,36] were from Switzerland [1,37,38] was from Spain [1,4] was from the Netherlands [38] and 1 was from Belgium [39]. The other 5 studies were multinational [40][41][42][43][44], with the authors originating from such countries as Australia, Brazil, Canada, Hong Kong and the UK.…”