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.
Validation Process - Exclusion Criteria
| 1. Papers published after April 1, 2015 (the date of data collection) |
| 2. Articles published in non peer-reviewed journals, or in biomedical journals that are not indexed by Pubmed (as this is a basic marker of journal quality) including popular magazines and newspaper articles |
| 3. Textbook chapters |
| 4. Patents |
