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 Custom Filters

Results by year

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

Year Number of Results
1950 1
1954 1
1955 1
1979 1
1980 8
1981 9
1982 6
1983 8
1984 7
1985 13
1986 11
1987 15
1988 10
1989 13
1990 13
1991 26
1992 16
1993 29
1994 25
1995 37
1996 35
1997 47
1998 40
1999 45
2000 65
2001 66
2002 74
2003 106
2004 128
2005 156
2006 160
2007 163
2008 183
2009 228
2010 222
2011 272
2012 315
2013 392
2014 502
2015 557
2016 580
2017 649
2018 724
2019 858
2020 1018
2021 1209
2022 1456
2023 1518
2024 1638
2025 14

Publication date

Text availability

Article attribute

Article type

Additional filters

Article Language

Species

Sex

Age

Other

Search Results

12,353 results

Results by year

Filters applied: . Clear all
Page 1
12,353 results
You have reached the last available page of results. Please see the User Guide for more information.