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Results of the ROBIS tool.
| Review | Phase 2 | Phase 3 | |||
|---|---|---|---|---|---|
| 1.Study eligibility criteria | 2.Identification and selection of studies | 3.Data collection and study appraisal | 4.Synthesis and findings | Risk of bias in the review | |
| Wang (2015) | ☺ | ☹ | ☹ | ☺ | ☺ |
| Chen (2019) | ☺ | ☹ | ☺ | ☹ | ☹ |
| Gao (2019) | ☺ | ☹ | ☺ | ☹ | ☹ |
| Osani (2019) | ☺ | ☹ | ☺ | ? | ☺ |
| Qu (2020) | ☺ | ☹ | ☺ | ☹ | ☺ |
| Chen (2021) | ☺ | ☹ | ☺ | ☺ | ☺ |
Abbreviations ☺ = low risk of bias; ☹ = high risk of bias; ? = unclear.
