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

Filters

My NCBI Filters

Results by year

Table representation of search results timeline featuring number of search results per year.

Year Number of Results
1963 1
1964 1
1965 1
1966 6
1967 4
1968 3
1969 2
1970 4
1971 3
1972 1
1973 3
1974 2
1975 5
1976 8
1977 7
1978 11
1979 11
1980 15
1981 9
1982 7
1983 8
1984 7
1985 13
1986 3
1987 7
1988 5
1990 3
1991 3
1992 5
1993 1
1994 4
1995 3
1999 2
2000 2
2001 2
2002 3
2003 1
2005 1
2006 3
2007 7
2008 3
2009 4
2010 2
2011 2
2012 3
2013 2
2015 3
2016 4
2017 5
2018 7
2019 2
2020 5
2021 4
2022 1
2024 0

Text availability

Article attribute

Article type

Publication date

Similar articles for PMID: 6640457

223 results

Results by year

Filters applied: . Clear all
Page 1
223 results