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
1986 48
1987 45
1988 44
1989 42
1990 53
1991 53
1992 50
1993 55
1994 48
1995 58
1996 59
1997 56
1998 52
1999 57
2000 56
2001 74
2002 114
2003 142
2004 158
2005 227
2006 285
2007 321
2008 284
2009 313
2010 319
2011 369
2012 363
2013 299
2014 336
2015 464
2016 446
2017 292
2018 300
2019 322
2020 370
2021 348
2022 261
2023 291
2024 40

Text availability

Article attribute

Article type

Publication date

Search Results

5,816 results

Results by year

Filters applied: . Clear all
Page 1
5,816 results