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
1945 1
1951 16
1952 39
1953 36
1954 43
1955 35
1956 26
1957 38
1958 32
1959 11
1964 12
1965 70
1966 100
1967 91
1968 113
1969 96
1970 117
1971 140
1972 169
1973 195
1974 231
1975 206
1976 180
1977 180
1978 172
1979 161
1980 202
1981 153
1982 188
1983 181
1984 225
1985 240
1986 253
1987 228
1988 193
1989 187
1990 216
1991 185
1992 229
1993 288
1994 231
1995 286
1996 267
1997 261
1998 237
1999 240
2000 243
2001 254
2002 228
2003 224
2004 237
2005 239
2006 255
2007 249
2008 252
2009 249
2010 272
2011 241
2012 276
2013 276
2014 240
2015 233
2016 251
2017 238
2018 200
2019 174
2020 188
2021 123
2022 18
2023 10
2024 52

Search Results

11,567 results

Results by year

Filters applied: . Clear all
Page 1
11,567 results
You have reached the last available page of results. Please see the User Guide for more information.