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Table representation of search results timeline featuring number of search results per year.
Year
Number of Results
1964
1
1966
12
1967
12
1968
22
1969
27
1970
49
1971
34
1972
30
1973
51
1974
90
1975
39
1976
56
1977
64
1978
48
1979
42
1980
55
1981
57
1982
48
1983
48
1984
73
1985
74
1986
57
1987
49
1988
63
1989
65
1990
80
1991
68
1992
72
1993
61
1994
58
1995
50
1996
52
1997
52
1998
32
1999
32
2000
40
2001
37
2002
51
2003
47
2004
55
2005
66
2006
80
2007
70
2008
71
2009
78
2010
72
2011
82
2012
85
2013
99
2014
84
2015
72
2016
67
2017
63
2018
52
2019
46
2020
49
2021
30
2022
5
2024
9
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AMA
APA
MLA
NLM
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AMA
APA
MLA
NLM
Adaptive Clinical Trial
Address
Autobiography
Bibliography
Biography
Case Reports
Classical Article
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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Comparative Study
Congress
Consensus Development Conference
Consensus Development Conference, NIH
Controlled Clinical Trial
Corrected and Republished Article
Dataset
Dictionary
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Duplicate Publication
Editorial
Electronic Supplementary Materials
English Abstract
Equivalence Trial
Evaluation Study
Expression of Concern
Festschrift
Government Publication
Guideline
Historical Article
Interactive Tutorial
Interview
Introductory Journal Article
Lecture
Legal Case
Legislation
Letter
Multicenter Study
News
Newspaper Article
Observational Study
Observational Study, Veterinary
Overall
Patient Education Handout
Periodical Index
Personal Narrative
Portrait
Practice Guideline
Pragmatic Clinical Trial
Preprint
Published Erratum
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
Retracted Publication
Retraction of Publication
Scientific Integrity Review
Technical Report
Twin Study
Validation Study
Video-Audio Media
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