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.
Study flow diagram. A total of 2512 records identified through electronic database search. After removing 904 duplicates, a total of 1608 references were screened for titles and abstracts, eight articles were selected for full‐text review. Of these, three articles were retrospective studies and one article was a prospective non‐randomised study. Four studies were selected for final meta‐analysis.
