Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation

Search Page

Filters

My NCBI Filters

Results by year

Table representation of search results timeline featuring number of search results per year.

Year Number of Results
1968 2
1974 1
1994 1
2001 1
2002 53
2003 207
2004 244
2005 247
2006 292
2007 301
2008 294
2009 269
2010 268
2011 247
2012 259
2013 268
2014 287
2015 294
2016 197
2017 210
2018 158
2019 181
2020 167
2021 155
2022 134
2023 115
2024 48

Text availability

Article attribute

Article type

Publication date

Search Results

4,292 results

Results by year

Filters applied: . Clear all
Page 1
4,292 results