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Risk of bias in the prospective randomized controlled trials.
| Study | Adequate random sequence generation | Allocation concealment | Blinding of participants, personnel and outcome assessors | Incomplete outcome data | Selective outcome reporting | Other sources of bias |
|---|---|---|---|---|---|---|
| Gianni 2018 | Yes | No | No | No | No | No |
| Kuwayama 2018 | Unclear | Unclear | Unclear | No | No | No |
| Untch 2016 | Yes | No | No | No | No | No |
