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.
Cumulative retractions, expressions of concern from 2010-2018 as indexed in http://retractiondatabase.org/. Data were generated by entering the first and last date of each year in the “Retractions or Other Notices” text box entry. Note that RetractionWatch started in 2010, hence there are no data prior to 2010.
