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

Edit custom filters

Results by year

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

Year Number of Results
1970 10
1971 44
1972 51
1973 58
1974 58
1975 53
1976 76
1977 79
1978 74
1979 88
1980 84
1981 86
1982 98
1983 102
1984 99
1985 91
1986 95
1987 100
1988 100
1989 104
1990 101
1991 104
1992 106
1993 103
1994 95
1995 124
1996 125
1997 142
1998 142
1999 147
2000 140
2001 140
2002 144
2003 150
2004 151
2005 194
2006 223
2007 268
2008 318
2009 350
2010 365
2011 415
2012 415
2013 441
2014 466
2015 399
2016 402
2017 455
2018 548
2019 616
2020 717
2021 764
2022 778
2023 980
2024 476
2025 389
2026 316

Publication date

Text availability

Article attribute

Article type

Additional filters

Article Language

Species

Sex

Age

Other

Search Results

10,187 results

Results by year

Filters applied: . Clear all
Page 1
10,187 results
You have reached the last available page of results. Please see the User Guide for more information.