| Date | Event | Description |
|---|---|---|
| 4 January 2010 | New citation required and major changes | A new team of review authors have taken over this previously withdrawn protocol. |
| 1 September 2009 | Amended | Protocol was withdrawn from Issue 1, 2010 of the Cochrane Library. |
| 6 February 2008 | Amended | Converted to new review format |
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.