| Date | Event | Description |
|---|---|---|
| 2 December 2016 | New search has been performed | Issue 1 2017: The electronic searches were updated on 2 December 2016 |
| 2 December 2016 | New citation required but conclusions have not changed | Issue 1 2017: No new trials that met the inclusion criteria were identified |
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.