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Table representation of search results timeline featuring number of search results per year.
Year
Number of Results
1953
6
1954
6
1955
4
1956
4
1957
9
1958
4
1959
4
1963
1
1965
35
1966
89
1967
105
1968
125
1969
132
1970
141
1971
132
1972
124
1973
161
1974
144
1975
153
1976
117
1977
101
1978
79
1979
84
1980
92
1981
81
1982
65
1983
84
1984
67
1985
81
1986
71
1987
80
1988
88
1989
73
1990
57
1991
65
1992
45
1993
45
1994
46
1995
41
1996
34
1997
50
1998
43
1999
45
2000
35
2001
45
2002
61
2003
41
2004
52
2005
69
2006
83
2007
77
2008
76
2009
69
2010
77
2011
117
2012
86
2013
64
2014
77
2015
79
2016
90
2017
66
2018
61
2019
63
2020
68
2021
25
2022
5
2023
1
2024
18
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Adaptive Clinical Trial
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Autobiography
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Clinical Trial Protocol
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Clinical Trial, Phase II
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Patient Education Handout
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Randomized Controlled Trial, Veterinary
Research Support, American Recovery and Reinvestment Act
Research Support, N.I.H., Extramural
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Research Support, U.S. Gov't
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