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 Custom Filters

Results by year

Table representation of search results timeline featuring number of search results per year.

Year Number of Results
1957 1
1960 1
1961 1
1965 2
1966 8
1967 18
1968 28
1969 58
1970 83
1971 87
1972 116
1973 97
1974 114
1975 61
1976 34
1977 45
1978 52
1979 56
1980 53
1981 41
1982 46
1983 57
1984 83
1985 50
1986 76
1987 54
1988 63
1989 98
1990 96
1991 129
1992 132
1993 119
1994 152
1995 146
1996 160
1997 209
1998 183
1999 182
2000 252
2001 206
2002 236
2003 287
2004 297
2005 270
2006 315
2007 315
2008 320
2009 339
2010 341
2011 355
2012 354
2013 324
2014 349
2015 361
2016 360
2017 408
2018 369
2019 385
2020 294
2021 160
2022 17
2023 14
2024 140

Publication date

Text availability

Article attribute

Article type

Additional filters

Article Language

Species

Sex

Age

Other

Search Results

9,287 results

Results by year

Filters applied: . Clear all
Page 1
9,287 results