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 2
1954 2
1955 1
1956 1
1957 2
1958 10
1959 4
1960 3
1961 4
1962 3
1964 1
1966 8
1967 24
1968 31
1969 32
1970 38
1971 42
1972 48
1973 63
1974 58
1975 74
1976 52
1977 46
1978 62
1979 67
1980 53
1981 49
1982 64
1983 57
1984 72
1985 54
1986 53
1987 56
1988 50
1989 72
1990 70
1991 72
1992 68
1993 65
1994 67
1995 54
1996 60
1997 52
1998 52
1999 73
2000 48
2001 82
2002 79
2003 84
2004 86
2005 93
2006 114
2007 118
2008 152
2009 140
2010 127
2011 144
2012 174
2013 217
2014 209
2015 188
2016 189
2017 185
2018 172
2019 154
2020 130
2021 73
2022 8
2023 3
2024 43

Search Results

4,528 results

Results by year

Filters applied: . Clear all
Page 1
4,528 results