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
1951 1
1952 2
1956 2
1958 2
1959 4
1961 1
1962 5
1963 1
1964 2
1965 6
1966 4
1967 1
1968 2
1969 2
1970 1
1971 3
1972 1
1973 4
1974 7
1975 2
1976 5
1977 5
1978 10
1979 12
1980 26
1981 13
1982 34
1983 37
1984 40
1985 38
1986 51
1987 55
1988 61
1989 60
1990 64
1991 84
1992 103
1993 122
1994 160
1995 189
1996 202
1997 228
1998 238
1999 274
2000 345
2001 383
2002 508
2003 626
2004 741
2005 930
2006 1104
2007 1243
2008 1501
2009 1646
2010 2010
2011 2459
2012 2766
2013 3197
2014 3834
2015 4224
2016 4581
2017 4981
2018 5592
2019 6525
2020 7550
2021 8679
2022 10226
2023 9817
2024 10985
2025 10762
2026 50

Publication date

Text availability

Article attribute

Article type

Additional filters

Article Language

Species

Sex

Age

Other

Search Results

98,266 results

Results by year

Filters applied: . Clear all
Page 1
98,266 results
You have reached the last available page of results. Please see the User Guide for more information.