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 strategy on PubMed
| Step | Query | Records retrieved |
|---|---|---|
| 1 | Search retract* | 34,000 |
| 2 | Search retract* Filters: Humans | 18,448 |
| 3 | Search retract* Filters: Humans; English | 15,608 |
| 4 | Search retract* Filters: Humans; English; Retracted Publication; Publication date from 1980/1/1 to 2016/02/11 | 2,310 |
