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.
Search strategies
| Database searched | Results 31st July 2015 |
|---|---|
| MEDLINE, 1st January 2008 to 31st July 2015 | 145 |
| CINHAL , 1st January 2008 to 31st July 2015 | 21 |
| EMBASE, 1st January 2008 to 31st July 2015 | 107 |
| THE COCHRANE LIBRARY, Issue 7 of 12, July (2015). 1st January 2008 to 31st July 2015 | 9 |
| Grey Literature 1st January 2008 to 31st July 2015 | 238 |
| Total (including duplicates) | 520 |
