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Table representation of search results timeline featuring number of search results per year.
Year
Number of Results
1963
1
1965
2
1966
31
1967
51
1968
45
1969
52
1970
46
1971
65
1972
60
1973
71
1974
75
1975
75
1976
78
1977
66
1978
62
1979
67
1980
75
1981
87
1982
85
1983
89
1984
96
1985
70
1986
71
1987
66
1988
91
1989
83
1990
57
1991
68
1992
64
1993
53
1994
64
1995
69
1996
55
1997
51
1998
64
1999
53
2000
63
2001
81
2002
62
2003
87
2004
91
2005
83
2006
95
2007
99
2008
116
2009
98
2010
95
2011
107
2012
101
2013
105
2014
96
2015
76
2016
80
2017
89
2018
83
2019
65
2020
54
2021
36
2022
5
2023
3
2024
37
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AMA
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MLA
NLM
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AMA
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Adaptive Clinical Trial
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Autobiography
Bibliography
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Case Reports
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Clinical Conference
Clinical Study
Clinical Trial Protocol
Clinical Trial, Phase I
Clinical Trial, Phase II
Clinical Trial, Phase III
Clinical Trial, Phase IV
Clinical Trial, Veterinary
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Controlled Clinical Trial
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Observational Study, Veterinary
Overall
Patient Education Handout
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Practice Guideline
Pragmatic Clinical Trial
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Randomized Controlled Trial, Veterinary
Research Support, American Recovery and Reinvestment Act
Research Support, N.I.H., Extramural
Research Support, N.I.H., Intramural
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.
Research Support, U.S. Gov't, P.H.S.
Research Support, U.S. Gov't
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Scientific Integrity Review
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Twin Study
Validation Study
Video-Audio Media
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