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 2
1953 3
1954 3
1955 7
1956 8
1957 10
1958 10
1959 5
1960 4
1961 6
1962 3
1963 1
1964 11
1965 45
1966 102
1967 155
1968 116
1969 137
1970 214
1971 256
1972 257
1973 259
1974 291
1975 282
1976 363
1977 357
1978 318
1979 346
1980 308
1981 314
1982 313
1983 386
1984 365
1985 372
1986 399
1987 375
1988 320
1989 393
1990 452
1991 447
1992 380
1993 386
1994 404
1995 426
1996 397
1997 462
1998 412
1999 422
2000 444
2001 490
2002 558
2003 535
2004 558
2005 580
2006 569
2007 586
2008 577
2009 650
2010 665
2011 736
2012 766
2013 721
2014 703
2015 668
2016 642
2017 698
2018 656
2019 742
2020 654
2021 465
2022 406
2023 407
2024 252

Search Results

24,199 results

Results by year

Filters applied: . Clear all
Page 1
24,199 results
You have reached the last available page of results. Please see the User Guide for more information.