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Quality assessment based on the newcastle–Ottawa scale.
| Study | Year | Selection | Comparability | Outcome | Total score |
|---|---|---|---|---|---|
| Utaijaratrasmi | 2018 | 3 | 2 | 3 | 8 |
| Gopalan et al | 2018 | 4 | 2 | 2 | 8 |
| Fesler et al | 2018 | 3 | 1 | 2 | 6 |
| Shi et al | 2017 | 3 | 2 | 2 | 7 |
| Kontos et al | 2017 | 3 | 2 | 2 | 7 |
| Li.J et al | 2016 | 3 | 2 | 2 | 7 |
| Xie et al | 2015 | 4 | 2 | 2 | 8 |
| Shinden et al | 2015 | 3 | 2 | 2 | 7 |
| Li.F et al | 2015 | 3 | 2 | 3 | 8 |
| Xiao et al | 2014 | 3 | 2 | 2 | 7 |
