| Date | Event | Description |
|---|---|---|
| 16 September 2013 | Amended | This review is being updated following a new protocol in preparation and will be withdrawn when the new review is published. See Published notes. |
| 1 September 2008 | Amended | Converted to new review format. |
| 16 August 2007 | New search has been performed | This update identified five new trials (Chang 2006; Grosset 2005; Kopp 2000; Lehmann 2001; Wolanskyj 2000), which brings the total of included studies up to 48. The new trials located in this updated search have provided no additional information nor changed the original reviews results and conclusions. |
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.