Level of conclusions
| Conclusions based on | |
|---|---|
| 1 | Research of level A1 or at least two examinations of level A2 performed independently of each other, with consistent results |
| 2 | One examination of level A2 or at least two examinations of level B, performed independently of each other |
| 3 | One examination of level B or C |
| 4 | Opinion of experts |