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 NCBI Filters

Results by year

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

Year Number of Results
1962 1
1964 3
1967 1
1968 1
1969 1
1970 2
1971 1
1972 9
1973 8
1974 6
1975 16
1976 8
1977 7
1978 8
1979 10
1980 15
1981 22
1982 24
1983 21
1984 22
1985 35
1986 33
1987 47
1988 41
1989 37
1990 43
1991 59
1992 73
1993 77
1994 98
1995 120
1996 114
1997 108
1998 115
1999 128
2000 164
2001 204
2002 258
2003 301
2004 336
2005 447
2006 486
2007 564
2008 599
2009 680
2010 772
2011 978
2012 1246
2013 1420
2014 1665
2015 1799
2016 1898
2017 2199
2018 2504
2019 2767
2020 3357
2021 3678
2022 4327
2023 4085
2024 1598

Text availability

Article attribute

Article type

Publication date

Search Results

35,561 results

Results by year

Filters applied: . Clear all
Page 1
35,561 results
You have reached the last available page of results. Please see the User Guide for more information.