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
1947 1
1948 1
1950 1
1954 1
1955 3
1960 2
1961 2
1963 4
1964 3
1965 13
1966 15
1967 22
1968 15
1969 13
1970 9
1971 6
1972 16
1973 13
1974 13
1975 5
1976 6
1977 6
1978 3
1979 1
1980 1
1981 5
1982 5
1983 4
1984 5
1985 3
1986 6
1987 7
1988 2
1989 1
1990 1
1991 2
1992 1
1993 5
1994 2
1995 2
1997 1
1998 3
1999 2
2000 3
2002 2
2003 1
2004 3
2005 3
2006 5
2007 4
2008 2
2009 1
2018 1
2024 0

Text availability

Article attribute

Article type

Publication date

Similar articles for PMID: 6581631

254 results

Results by year

Filters applied: . Clear all
Page 1
254 results