Figure 1.
Study selection
71 studies were included overall. (A) First study search date was between Jan 1, 1847, and Jan 1, 2021. (B) Second study search date was between Jan 1, 2021, and May 27, 2022.
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.