| Strength of recommendation | |
|---|---|
| 1 | Strong |
| 2 | Weak |
| Levels of Evidence | |
| A | High quality meta‐analysis |
| B | Robust phase 3 studies |
| C | Well designed phase 2 studies, or good quality case series |
| D | Expert panel consensus |
*Strength of recommendation and grading of evidence as reviewed by the expert panel from 1 January 1996 to 1 February 2021. 4 , 5 Statements graded (1A) are strong consensus recommendations supported by high quality meta‐analyses, while statements graded (2D) are weak opinions unsupported by any evidence but agreed upon by all authors.