| Hospitals approached | Hospitals entering web-based questionnaire | Hospitals concluding web-based questionnaire | |
| UK | 250 | 41 | 14 |
| Ireland | 44 | 29 | 25 |
| The Netherlands | 97 | 12 | 10 |
| Belgium | 45 | 33 | 25 |
| France | 322 | 100 | 78 |
| Spain | 307 | 131 | 113 |
| Poland | 250 | 84 | 80 |
| Czech Republic | 81 | 53 | 44 |
| Total | 1396 | 483 | 389 |