| Date | Event | Description |
|---|---|---|
| 4 January 2012 | New citation required and major changes | New authors. Substantial changes to methodology since protocol last published, including updated 'Risk of bias' tool, addition of 'Summary of findings' table, and a priori specification of outcomes to be included in the 'Summary of findings' table |
| 12 September 2008 | Amended | Converted to new review format CMSG ID: C126‐P |
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