| Study | Reason for exclusion |
|---|---|
| Leslie 1993 | This study was identified through the search of the Cochrane Central Register of Controlled Trials Database in the Cochrane Library. This was a controlled but not a randomised trial |
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.