Of the 23 articles reviewed, the studies originated from four continents and 14 countries. In Asia, there were studies from Indonesia, [37] China, [34] Japan, [35] South Korea, [23,[29], [30], [31],36] Saudi Arabia, [38] and Turkey [22]. Africa was represented by studies from South Africa [24] and Ethiopia. [25,26] North America had contributions from the United States [21,28,40]. Finally, Europe was represented by studies from Germany, [33] Netherlands, [20,27] Italy, [18,39] Sweden [32] and