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
1964 1
1965 14
1966 42
1967 46
1968 53
1969 40
1970 45
1971 40
1972 36
1973 43
1974 64
1975 47
1976 38
1977 27
1978 32
1979 21
1980 32
1981 18
1982 29
1983 22
1984 19
1985 19
1986 16
1987 16
1988 13
1989 26
1990 22
1991 20
1992 10
1993 11
1994 12
1995 9
1996 5
1997 8
1998 7
1999 12
2000 11
2001 13
2002 5
2003 12
2004 8
2005 6
2006 7
2007 4
2008 6
2009 5
2010 3
2011 5
2012 6
2013 5
2014 6
2015 3
2016 3
2017 2
2018 3
2021 1
2022 1
2023 2
2026 0

Publication date

Text availability

Article attribute

Article type

Additional filters

Article Language

Species

Sex

Age

Other

Search Results

1,022 results

Results by year

Filters applied: . Clear all
Page 1
1,022 results