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
1974 80
1975 62
1976 105
1977 67
1978 94
1979 38
1980 47
1981 44
1982 39
1983 32
1984 45
1985 38
1986 37
1987 43
1988 46
1989 38
1990 44
1991 47
1992 62
1993 48
1994 56
1995 51
1996 61
1997 43
1998 50
1999 29
2000 66
2001 69
2002 61
2003 63
2004 70
2005 64
2006 60
2007 52
2008 61
2009 61
2010 62
2011 57
2012 52
2013 41
2014 56
2015 43
2016 58
2017 18
2024 0

Text availability

Article attribute

Article type

Publication date

Search Results

2,360 results

Results by year

Filters applied: . Clear all
Page 1
2,360 results