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
1973 2
1981 1
1982 1
1985 1
1986 1
1988 2
1989 1
1990 2
1992 2
1993 1
1994 2
1995 5
1996 7
1997 3
1998 4
1999 9
2000 10
2001 14
2002 18
2003 20
2004 21
2005 22
2006 37
2007 49
2008 50
2009 52
2010 43
2011 72
2012 83
2013 89
2014 99
2015 120
2016 99
2017 102
2018 101
2019 109
2020 98
2021 131
2022 82
2023 97
2024 50

Text availability

Article attribute

Article type

Publication date

Search Results

1,530 results

Results by year

Filters applied: . Clear all
Page 1
1,530 results