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
1970 2
1976 1
1981 1
1982 1
1984 4
1985 2
1986 5
1987 8
1988 10
1989 28
1990 40
1991 32
1992 34
1993 34
1994 25
1995 37
1996 39
1997 45
1998 42
1999 26
2000 34
2001 31
2002 32
2003 24
2004 27
2005 33
2006 33
2007 33
2008 44
2009 41
2010 18
2011 26
2012 25
2013 35
2014 63
2015 87
2016 103
2017 115
2018 139
2019 144
2020 118
2021 110
2022 129
2023 169
2024 102

Text availability

Article attribute

Article type

Publication date

Search Results

1,944 results

Results by year

Filters applied: . Clear all
Page 1
1,944 results