Figure - PMC

Skip to main content

An official website of the United States government

Here's how you know

Here's how you know

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.

View full-text article in PMC

. 2019 Jan 31;16:4. doi: 10.3352/jeehp.2019.16.4

Search in PMC
Search in PubMed
View in NLM Catalog
Add to search

© 2019, Korea Health Personnel Licensing Examination Institute

This is an open-access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

PMC Copyright notice

Fig. 1. — Study selection process using the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) checklist. CINAHL, Cumulative Index to Nursing and Allied Health Literature; ERIC, Education Resources Information Center.