| Date | Event | Description |
|---|---|---|
| 9 May 2009 | Amended | Post‐hoc change in the protocol ‐ Unit of analysis issues added; cross‐over trials considered as inappropriate for speech intervention. |
| 20 January 2009 | Amended | Converted to new review format. |
| 9 April 2008 | New citation required and conclusions have changed | Substantive amendment |
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