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
1947 2
1948 2
1949 1
1954 2
1956 36
1957 85
1958 94
1959 61
1960 64
1961 67
1962 17
1963 1
1964 10
1965 75
1966 122
1967 143
1968 130
1969 156
1970 123
1971 128
1972 111
1973 96
1974 94
1975 83
1976 107
1977 88
1978 88
1979 120
1980 90
1981 105
1982 65
1983 62
1984 73
1985 67
1986 57
1987 85
1988 90
1989 86
1990 86
1991 82
1992 77
1993 83
1994 75
1995 96
1996 104
1997 108
1998 142
1999 162
2000 179
2001 181
2002 206
2003 297
2004 267
2005 305
2006 315
2007 356
2008 346
2009 354
2010 430
2011 433
2012 464
2013 519
2014 557
2015 581
2016 563
2017 541
2018 570
2019 634
2020 754
2021 955
2022 1094
2023 973
2024 846

Publication date

Text availability

Article attribute

Article type

Additional filters

Article Language

Species

Sex

Age

Other

Search Results

15,317 results

Results by year

Filters applied: . Clear all
Page 1
15,317 results
You have reached the last available page of results. Please see the User Guide for more information.