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Table representation of search results timeline featuring number of search results per year.
Year
Number of Results
1966
2
1967
4
1968
2
1969
2
1970
2
1971
3
1972
4
1973
5
1974
9
1975
10
1976
9
1977
11
1978
6
1979
14
1980
10
1981
17
1982
13
1983
17
1984
21
1985
26
1986
29
1987
15
1988
23
1989
22
1990
20
1991
32
1992
23
1993
23
1994
39
1995
39
1996
42
1997
56
1998
61
1999
68
2000
81
2001
81
2002
77
2003
80
2004
115
2005
122
2006
128
2007
126
2008
134
2009
132
2010
144
2011
160
2012
121
2013
108
2014
91
2015
72
2016
53
2017
51
2018
54
2019
49
2020
37
2021
15
2024
2
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MLA
NLM
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AMA
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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
Directory
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
Webcast
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