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| Bias | Mahomed et al. 2004 | Kelly et al. 1999 |
|---|---|---|
| Selection | Insufficient data to determine | +++ |
| Performance | Insufficient data to determine | – |
| Detection | – | – |
| Attrition | – | – |
| Other limitations | Grey literature | Did not use WOMAC Short follow-up period (3 months) |
No (–) Possible(+) Probable (++) Yes (+++)
