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 Feb 8;16(3):486. doi: 10.3390/ijerph16030486

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

© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

PMC Copyright notice

Evolution of scientific production. Vertical axis, number of articles published; Horizontal axis, year of publication; Grey line, total number of relevant articles identified from Web of Science (WOS) and SCOPUS to be analyzed; Blue line, selected articles from WOS; Orange line, selected articles from SCOPUS.