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Table representation of search results timeline featuring number of search results per year.
Year
Number of Results
1946
9
1947
5
1948
6
1949
2
1951
9
1952
32
1953
28
1954
31
1955
32
1956
24
1957
32
1958
32
1959
30
1960
20
1961
21
1962
14
1964
1
1965
36
1966
67
1967
78
1968
79
1969
80
1970
111
1971
138
1972
102
1973
89
1974
131
1975
130
1976
133
1977
140
1978
124
1979
150
1980
145
1981
173
1982
165
1983
193
1984
233
1985
204
1986
250
1987
257
1988
278
1989
322
1990
409
1991
383
1992
314
1993
343
1994
377
1995
319
1996
407
1997
467
1998
498
1999
595
2000
610
2001
564
2002
724
2003
706
2004
832
2005
918
2006
1019
2007
1176
2008
1153
2009
1179
2010
1271
2011
1159
2012
1435
2013
1476
2014
1479
2015
1577
2016
1555
2017
1565
2018
1553
2019
1672
2020
1651
2021
1454
2022
1596
2023
1375
2024
671
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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
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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