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Study Quality Assessment Using the Cochrane Risk-of-Bias Assessment Tool
| Study | Domain 1 | Domain 2a | Domain 2b | Domain 3 | Domain 4 | Domain 5 | Overall risk-of-bias judgment |
| Fricka 2019 | Low | Low | Low | Low | Low | Low | Low |
| Pulido 2015 | Low | Low | Low | Low | Low | Low | Low |
| Fernandez-Fairen 2013 | Low | Low | Low | Low | Low | Low | Low |
| Wilson 2012 | Low | Low | Low | Low | Low | Low | Low |
