Table 1 Number of studies per country and continent
Continent | Country | Number of studies |
|---|---|---|
Asia | China | 1 |
Australasia | Australia | 2 |
Europe | Finland | 1 |
Europe | France | 3 |
Europe | Germany | 1 |
Europe | Italy | 2 |
Europe | Sweden | 3 |
North America | Canada | 5 |
North America | Mexico | 1 |
North America | USA | 17 |
South America | Brazil | 1 |
South America | Chile | 1 |