| Study | Reason for exclusion |
|---|---|
| Hamilcikan 2017a | Not a randomised or quasi‐randomised trial |
| Hamilcikan 2017b | Not a randomised or quasi‐randomised trial |
| Lauterbach 1994 | Not a randomised or quasi‐randomised trial |
| Selim 2004 | Not a randomised or quasi‐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.