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Quality of the included studies
| Study | Selection score | Comparability score | Outcome score | Total score | Quality |
|---|---|---|---|---|---|
| Bytoft et al, 201719 | 4 | 2 | 3 | 9 | High |
| Nielsen et al, 201712 | 3 | 2 | 3 | 8 | High |
| Daraki et al, 201720 | 4 | 2 | 3 | 9 | High |
| Nomura et al, 201210 | 4 | 2 | 3 | 9 | High |
| Li et al, 201411 | 3 | 0 | 2 | 5 | Moderate |
| Ji et al, 201813 | 3 | 2 | 3 | 8 | High |
| Schmitt and Romanos, 201221 | 4 | 2 | 2 | 8 | High |
| Hegvik et al, 201814 | 3 | 2 | 3 | 8 | High |
| Instanes et al, 20178 | 4 | 2 | 2 | 8 | High |
