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 1
1957 1
1960 2
1962 1
1963 7
1964 1
1965 1
1966 2
1967 1
1969 5
1970 3
1972 1
1973 6
1974 1
1975 2
1976 3
1977 6
1978 1
1979 6
1980 3
1982 2
1983 1
1984 4
1985 4
1986 6
1987 9
1988 23
1989 20
1990 12
1991 17
1992 26
1993 21
1994 23
1995 30
1996 25
1997 26
1998 23
1999 23
2000 39
2001 36
2002 49
2003 36
2004 37
2005 34
2006 52
2007 54
2008 70
2009 79
2010 63
2011 75
2012 100
2013 99
2014 102
2015 97
2016 97
2017 128
2018 105
2019 113
2020 107
2021 138
2022 121
2023 113
2024 84

Text availability

Article attribute

Article type

Publication date

Search Results

2,125 results

Results by year

Filters applied: . Clear all
Page 1
2,125 results