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Results by year

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

Year Number of Results
1965 1
1967 2
1968 2
1970 1
1971 2
1972 2
1973 2
1974 2
1975 3
1976 1
1977 2
1978 6
1979 3
1980 3
1981 1
1982 5
1983 6
1984 11
1985 4
1986 11
1987 5
1988 10
1989 9
1990 5
1991 9
1992 9
1993 12
1994 14
1995 19
1996 22
1997 23
1998 9
1999 10
2000 13
2001 11
2002 15
2003 15
2004 12
2005 16
2006 24
2007 15
2008 31
2009 18
2010 15
2011 16
2012 15
2013 27
2014 15
2015 18
2016 29
2017 30
2018 37
2019 29
2020 44
2021 51
2022 48
2023 31
2024 29
2025 10

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161 results

Results by year

Filters applied: Randomized Controlled Trial, in the last 5 years, Humans, English. Clear all
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161 results