Table 1.
The search strategy of this review.
| Search Engines and Databases |
|
| Search date | up to 2020, November, 22 |
| Search terms | Strategy: #1 and #2, #1 AND #3, #1 AND #4, #1 AND #5, #1 AND #6, #1 AND #7
|
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.