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
1960 1
1972 3
1973 1
1975 1
1977 5
1979 3
1980 5
1981 8
1982 9
1983 6
1984 9
1985 6
1986 5
1987 14
1988 20
1989 12
1990 9
1991 11
1992 19
1993 11
1994 26
1995 24
1996 36
1997 34
1998 36
1999 41
2000 51
2001 74
2002 76
2003 89
2004 108
2005 144
2006 133
2007 173
2008 197
2009 233
2010 283
2011 352
2012 390
2013 455
2014 532
2015 628
2016 643
2017 715
2018 837
2019 928
2020 1127
2021 1201
2022 1424
2023 1353
2024 574

Text availability

Article attribute

Article type

Publication date

Search Results

11,668 results

Results by year

Filters applied: . Clear all
Page 1
11,668 results
You have reached the last available page of results. Please see the User Guide for more information.