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Geographic distribution of the selected articles.
| Country | Articles, N | Year |
| Belgium | 2 | 2018 |
| Canada | 4 | 2018, 2019 |
| Czech Republic | 2 | 2015 |
| France | 1 | 2017 |
| Germany | 7 | 2016, 2018, 2019 |
| Ireland | 3 | 2016, 2018, 2019 |
| Netherlands | 5 | 2016, 2017, 2019 |
| Portugal | 3 | 2017-2019 |
| Switzerland | 1 | 2019 |
| Sweden | 1 | 2017 |
| United Arab Emirates | 1 | 2018 |
| United Kingdom | 5 | 2016, 2017, 2019 |
| United States | 45 | 2013-2019 |
