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
1988 1
1991 2
1992 41
1993 51
1994 87
1995 71
1996 65
1997 65
1998 65
1999 144
2000 174
2001 231
2002 253
2003 279
2004 284
2005 285
2006 294
2007 331
2008 287
2009 343
2010 322
2011 396
2012 307
2013 233
2014 214
2015 186
2016 162
2017 161
2018 145
2019 148
2020 145
2021 116
2022 39
2023 38
2024 24

Text availability

Article attribute

Article type

Publication date

Search Results

5,415 results

Results by year

Filters applied: . Clear all
Page 1
5,415 results