| First author/publication year | Random sequence generation | Allocation concealment | Blinding of participants and personnel | Blinding of outcome assessment | Incomplete outcome data | Free from selective reporting | Other sources of bias |
|---|---|---|---|---|---|---|---|
| Bing 1981 | − | − | − | − | − | − | ? |
| Zacharias 1981 | − | + | − | − | − | − | ? |
| Milia P 2006 | − | − | + | − | − | − | ? |
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