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
1977 1
1981 3
1982 4
1983 6
1984 9
1985 8
1986 8
1987 9
1988 17
1989 22
1990 27
1991 26
1992 17
1993 21
1994 18
1995 24
1996 18
1997 20
1998 23
1999 13
2000 14
2001 13
2002 15
2003 11
2004 8
2005 11
2006 12
2007 26
2008 14
2009 14
2010 11
2011 8
2012 10
2013 10
2014 10
2015 4
2016 9
2017 7
2018 1
2019 3
2020 4
2021 3
2022 2
2023 4
2024 6

Publication date

Text availability

Article attribute

Article type

Additional filters

Article Language

Species

Sex

Age

Other

Search Results

512 results

Results by year

Filters applied: . Clear all
Page 1
512 results