| Date | Event | Description |
|---|---|---|
| 1 June 2016 | New citation required but conclusions have not changed | Review updated, new evidence added but conclusions of review not changed. |
| 10 March 2016 | New search has been performed | Results of update search added to the review. Three new studies added. |
| 5 November 2015 | Amended | Title changed and scope of review expanded. Search updated and 4 studies (11 references) added to Characteristics of studies awaiting classification. |
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.