Table 3.

Countries in which the studies were conducted.

Country	Studies
Switzerland	[32]
United States	[33-42]
Japan	[43-45]
Germany	[46-48]
Finland	[49,50]
United Kingdom	[51-53]
Italy	[31,54-67]
France	[30,68-70]
Spain	[71,72]
Poland	[73]
Turkey	[74]
Belgium	[75]