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| Number | Study | Randomization | Allocation concealment | Double blinding | Withdrawals and dropouts | Total score |
| 1 | Adamson 2016 | 1 | 1 | 1 | 1 | 4 |
| 2 | Adamson 2014 | 1 | 1 | 1 | 1 | 4 |
| 3 | Adamson 2011 | 1 | 1 | 1 | 1 | 4 |
| 4 | Bourge 2008 | 1 | 1 | 2 | 1 | 5 |
