Table 3.

Definition of recommendation

Recommendation grade	Description
1	Good evidence (level 1 studies with consistent findings) for or against recommending intervention; treatment measures with good accessibility in China
2	Fair evidence (level 2 or 3 studies with consistent findings) for or against recommending intervention but with limited clinical benefit or poor accessibility in China
3	Conflicting or poor-quality evidence (level 4 or 5 studies) not allowing a recommendation for or against intervention with poor accessibility in China
4 (no recommendation)	There was insufficient evidence to make a recommendation