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
1948 2
1949 5
1950 2
1951 4
1952 8
1953 4
1954 4
1955 7
1956 4
1957 1
1958 2
1959 8
1960 5
1961 11
1962 8
1963 2
1964 11
1965 3
1967 1
1971 1
1973 10
1974 22
1975 38
1976 31
1977 27
1978 31
1979 25
1980 26
1981 35
1982 40
1983 26
1984 32
1985 42
1986 34
1987 25
1988 28
1989 26
1990 22
1991 32
1992 27
1993 28
1994 34
1995 41
1996 29
1997 27
1998 35
1999 40
2000 47
2001 54
2002 56
2003 54
2004 73
2005 79
2006 93
2007 101
2008 95
2009 118
2010 150
2011 139
2012 168
2013 175
2014 227
2015 216
2016 216
2017 198
2018 200
2019 233
2020 227
2021 192
2022 209
2023 220
2024 167
2025 1

Text availability

Article attribute

Article type

Publication date

Search Results

4,017 results

Results by year

Filters applied: . Clear all
Page 1
4,017 results