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
1991 7
1992 18
1993 10
1994 15
1995 20
1996 24
1997 30
1998 33
1999 39
2000 32
2001 38
2002 38
2003 42
2004 43
2005 40
2006 54
2007 68
2008 75
2009 82
2010 86
2011 86
2012 99
2013 71
2014 66
2015 70
2016 84
2017 72
2018 79
2019 72
2020 46
2021 21
2022 3
2024 0

Text availability

Article attribute

Article type

Publication date

Search Results

1,390 results

Results by year

Filters applied: . Clear all
Page 1
1,390 results