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
1975 1
1976 1
1978 1
1980 24
1981 31
1982 31
1983 93
1984 83
1985 116
1986 107
1987 111
1988 84
1989 100
1990 98
1991 87
1992 92
1993 96
1994 73
1995 77
1996 81
1997 66
1998 73
1999 62
2000 48
2001 52
2002 76
2003 64
2004 76
2005 68
2006 52
2007 81
2008 73
2009 79
2010 72
2011 80
2012 82
2013 73
2014 86
2015 84
2016 62
2017 59
2018 50
2019 58
2020 41
2021 39
2022 36
2023 28
2024 11

Text availability

Article attribute

Article type

Publication date

Search Results

2,935 results

Results by year

Filters applied: . Clear all
Page 1
2,935 results
-