Table 2.
Evaluation of risk of bias in included studies.
| Articles | ① | ② | ③ | ④ | ⑤A | ⑤B | ⑥ | ⑦ | ⑧ | NOS score |
| Squires MH 3rd | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 8 |
| Shwaartz C | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 8 |
| Wada S | 1 | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 1 | 8 |
NOS = Newcastle-Ottawa Scale.
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