Table 2.

Distribution of studies according to countries of implementation or first author location.

Countries	n	%
USA	17	27
Germany	11	17
China 1	10	10
Korea	5	8
Finland	3	5
UK	3	5
Sweden	2	3
Canada	2	3
The Netherlands	1	2
Italy	1	2
Kenya	1	2
Norway	1	2
India	1	2
Nigeria	1	2
Ireland	1	2
Turkey	1	2
Malaysia	1	2
Australia	1	2
South Africa	1	2
Different European countries 2	1	2
Different countries worldwide 2	1	2

Note. If no information on the study location was provided, the first author’s location is given. The total amount of n = 66 results from four studies containing either two samples or participants from different countries [7,45,53]. ¹ Including Taiwan (n = 4). ² The exact countries were not explicitly mentioned by the authors.