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Table representation of search results timeline featuring number of search results per year.
Year
Number of Results
1971
1
1983
2
1984
5
1985
10
1986
4
1987
8
1988
4
1989
9
1990
7
1991
11
1992
10
1993
4
1994
9
1995
11
1996
14
1997
18
1998
15
1999
23
2000
22
2001
35
2002
29
2003
34
2004
42
2005
60
2006
62
2007
57
2008
75
2009
61
2010
72
2011
78
2012
70
2013
64
2014
70
2015
86
2016
73
2017
91
2018
76
2019
63
2020
42
2021
33
2022
5
2023
1
2024
8
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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
Collected Work
Comment
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
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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
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Scientific Integrity Review
Technical Report
Twin Study
Validation Study
Video-Audio Media
Webcast
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