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.
Search queries and return values.
| Database name | Return value (n) |
| Cumulative Index to Nursing and Allied Health Literature Plus | 93 |
| MEDLINE | 159 |
| EMBASE | 279 |
| Institute of Electrical and Electronics Engineers Xplore | 31 |
| ProQuest Central | 747 |
| Scopus | 352 |
| Science Direct | 60 |
