| Databases | Hits |
| MEDLINE | 1742 |
| Embase | 3319 |
| CENTRAL | 2028 |
| PsycINFO | 1449 |
| PILOTS | 879 |
| Total | 9417 |
| ‐duplicates | ‐4635 |
| Studies to screen | 4782 |
| Date of Search | 3/3/18 |
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.