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Table representation of search results timeline featuring number of search results per year.
Year
Number of Results
1945
2
1948
1
1949
1
1950
8
1951
1
1952
3
1953
3
1954
5
1955
3
1956
2
1957
8
1958
6
1959
1
1960
8
1961
4
1962
9
1963
5
1964
9
1965
8
1973
1
1975
13
1976
19
1977
8
1978
9
1979
6
1980
13
1981
13
1982
9
1983
8
1984
13
1985
8
1986
5
1987
8
1988
6
1989
13
1990
11
1991
7
1992
14
1993
9
1994
22
1995
12
1996
13
1997
17
1998
17
1999
20
2000
27
2001
36
2002
91
2003
164
2004
176
2005
208
2006
252
2007
277
2008
311
2009
324
2010
353
2011
378
2012
429
2013
479
2014
449
2015
461
2016
501
2017
506
2018
497
2019
508
2020
612
2021
668
2022
775
2023
704
2024
365
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APA
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NLM
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Format:
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
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
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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