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
1952 1
1961 1
1975 1
1982 1
1989 1
1990 1
1991 3
1992 3
1993 1
1994 5
1995 10
1996 7
1997 7
1998 9
1999 8
2000 17
2001 13
2002 17
2003 12
2004 171
2005 18
2006 40
2007 40
2008 51
2009 76
2010 93
2011 122
2012 155
2013 133
2014 128
2015 176
2016 162
2017 161
2018 174
2019 158
2020 191
2021 205
2022 243
2023 230
2024 181

Text availability

Article attribute

Article type

Publication date

Search Results

2,591 results

Results by year

Filters applied: . Clear all
Page 1
2,591 results