Table 1 Nationality of responders
| Germany | 15 |
| Turkey | 9 |
| Austria | 8 |
| Croatia | 8 |
| France | 8 |
| Spain | 7 |
| Ireland | 5 |
| Italy | 5 |
| UK | 4 |
| Bulgaria | 4 |
| Switzerland | 3 |
| Romania | 3 |
| Israel | 2 |
| Kazakhstan | 2 |
| The Netherlands | 2 |
| Sweden | 2 |
| Slovenia | 2 |
| Denmark | 2 |
| Estonia | 2 |
| Finland | 1 |
| Slovakia | 1 |
| Belarus | 1 |
| Lithuania | 1 |
| Russia | 1 |