Table 3.
Tabular presentation of risk of bias of included SRs.
| 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 | |
| Gao (2011) | ☺ | ☹ | ? | ☺ | ☹ |
| Zheng (2012) | ☺ | ☺ | ☺ | ☹ | ☹ |
| Chen (2014) | ☺ | ☺ | ☺ | ☺ | ☺ |
| Yang (2014) | ☺ | ☹ | ☹ | ☹ | ☹ |
| Zhao (2014) | ☹ | ☹ | ☺ | ☺ | ☹ |
| Dai (2015) | ☺ | ☹ | ☹ | ☹ | ☹ |
| Yang (2015) | ☺ | ☺ | ☺ | ☺ | ☺ |
| Linde (2016) | ☺ | ☺ | ☺ | ☺ | ☺ |
| PuJ (2016) | ☹ | ☹ | ☺ | ☹ | ☹ |
| Pu (2016) | ☺ | ☺ | ☺ | ☺ | ☺ |
| Song (2016) | ☺ | ☺ | ☺ | ☺ | ☺ |
| Xian (2016) | ☺ | ☺ | ☺ | ☹ | ☺ |
| Zhao (2016) | ☺ | ☺ | ☺ | ☺ | ☺ |
| Xu (2018) | ☺ | ☺ | ☺ | ☹ | ☺ |
| Lu (2019) | ☺ | ☺ | ☺ | ☹ | ☺ |
☺ = low risk; ☹ = high risk; ? = unclear risk.