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
1948 1
1969 1
1970 1
1973 1
1974 1
1982 1
1983 1
1984 2
1985 1
1988 1
1989 2
1990 1
1991 1
1993 3
1995 2
1996 2
1997 4
1998 2
1999 3
2000 5
2001 8
2002 6
2003 8
2004 15
2005 19
2006 15
2007 24
2008 23
2009 34
2010 33
2011 51
2012 46
2013 61
2014 44
2015 61
2016 48
2017 54
2018 59
2019 62
2020 83
2021 90
2022 86
2023 86
2024 112
2025 104
2026 2

Publication date

Text availability

Article attribute

Article type

Additional filters

Article Language

Species

Sex

Age

Other

Search Results

1,142 results

Results by year

Filters applied: . Clear all
Page 1
1,142 results