Table 2.

Countries and related studies

Country name	References	N of studies
Austria	[10, 21]	2
Brazil	[22, 23]	2
Bulgaria	[10, 24]	2
Canada	[25]	1
China	[26]	1
Costa Rica	[27]	1
Cuba	[28],	1
Cyprus	[10, 29]	2
Czech Republic	[10]	1
Denmark	[10]	1
England	[10, 30–33],	5
Estonia	[10]	1
Finland	[34]	1
France	[10]	1
Greece	[5, 6, 10, 35–45],	14
Germany	[46, 47]	2
Hungary	[10]	1
Iran	[48–59]	11
Iraq	[60, 61]	2
Ireland	[10, 62, 63]	3
Italy	[10, 64],	2
Latvia	[10]	1
Lithuania	[10]	1
Luxemburg	[10]	1
Malta	[10]	1
Netherland	[10, 30]	2
Norway	[30]	1
Poland	[10]	1
Portugal	[10, 30, 65]	3
Romania	[10]	1
Slovenia	[10]	1
Slovakia	[10]	1
Spain	[10, 46, 47, 66–74]	12
Sweden	[30]	1
Tanzania	[75]	1
United States	[76–96]	22