Table 3 Assessment of the risk of bias of the included studies.
References | Risk of bias | Applicability concerns | |||||
|---|---|---|---|---|---|---|---|
Patient selection | Index test | Reference standard | Flow and timing | Patient selection | Index test | Reference standard | |
Poanta et al. 2014 | Low | Low | Low | Low | Low | Low | Low |
Xiang et al. 2014 | Low | Low | Low | Unclear | Low | Low | Low |
Hong et al. 2017 | Low | Low | Unclear | High | Low | Low | Low |
Cui et al. 2018 | High | Low | Low | Low | High | Low | Low |
Chen et al. 2019 | Low | Low | Low | Low | Low | Low | Low |
