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Number of included articles by country source(s) of patients/samples
| Country source(s) of patients/samples | Number of articles |
|---|---|
| Czech Republic | 3 |
| Denmark | 1 |
| Finland | 1 |
| Finland, Norway and Sweden | 1 |
| France | 1 |
| Germany | 9 |
| Germany and Greece | 1 |
| Hungary | 4 |
| Italy | 7 |
| Lithuania | 1 |
| The Netherlands | 1 |
| Norway, Sweden and the UK | 1 |
| Poland | 1 |
| Scotland | 1 |
| Slovenia | 1 |
| Sweden | 2 |
| Turkey | 1 |
| UK | 1 |
| Unclear | 1 |
| Total | 39 |
