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
1981 1
1985 2
1987 1
1989 4
1990 3
1991 2
1992 3
1993 5
1994 4
1995 6
1996 15
1997 8
1998 15
1999 8
2000 20
2001 18
2002 17
2003 30
2004 34
2005 57
2006 46
2007 59
2008 61
2009 90
2010 98
2011 135
2012 154
2013 166
2014 202
2015 220
2016 231
2017 264
2018 313
2019 313
2020 389
2021 391
2022 477
2023 444
2024 94

Text availability

Article attribute

Article type

Publication date

Search Results

3,929 results

Results by year

Filters applied: . Clear all
Page 1
3,929 results