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RCTs Quality assessment results
| Study | Sequence generation adequate? | Allocation concealment adequate | Blinding of outcome assessment | Incomplete outcome data assessed? | Free from selective reporting? |
|---|---|---|---|---|---|
| Crotty 2004 | Y | Y | N | Y | Y |
| Llewellyn-Jones 1999 | Y | U | Y | N | Y |
| Opie 2002 | Y | U | N | Y | Y |
| Schmidt 1998 | U | U | U | U | Y |
