Abstract

Background

Methods

Results

Conclusions

Keywords

Background

Methods

Protocol and guidance

Study selection

Inclusion criteria

Exclusion criteria

Missing data

Duplicate publications

Information sources and search strategy

Study selection

Data collection process

Outcomes

Subgroup and sensitivity analyses

Risk of bias and quality of evidence

Data synthesis

Results

Search results and characteristics of included studies

Risk of bias and quality of evidence

Primary outcome

Secondary outcomes

Subgroup analyses

Sensitivity analyses

Discussion

Findings and interpretations

Compared with other studies

Strengths and limitations

Conclusions