Table 2. The number of subjects in each country.
| Country | The number of subjects |
|---|---|
| Germany | 8 |
| US | 4 |
| China | 2 |
| UK | 2 |
| Austria | 1 |
| Brazil | 1 |
| France | 1 |
| Ireland | 1 |
| Norway | 1 |
| Sweden | 1 |
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