| A |
High strength of recommendation |
| B |
Medium strength of recommendation |
| 0 |
Low strength of recommendation |
|
Grade
|
Level of evidence
|
| Ia |
Highest level, evidence from meta-analyses or systematic reviews of randomized controlled trials |
| Ib |
Evidence from individual randomized controlled studies |
| II |
Evidence from cohort studies |
| III |
Evidence from case-control studies |
| IV |
Evidence from case series |
| V |
Expert consensus with systematic literature search, no studies found |
| GCP |
Expert consensus without a systematic literature search: Good Clinical Practice |
