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Table representation of search results timeline featuring number of search results per year.
Year
Number of Results
1992
4
1993
7
1994
8
1995
10
1996
8
1997
7
1998
11
1999
11
2000
16
2001
26
2002
21
2003
18
2004
18
2005
27
2006
24
2007
35
2008
38
2009
37
2010
22
2011
36
2012
41
2013
29
2014
38
2015
33
2016
34
2017
23
2018
24
2019
30
2020
16
2021
15
2022
10
2023
45
2024
209
2025
154
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APA
MLA
NLM
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AMA
APA
MLA
NLM
ARTICLE TYPE
Adaptive Clinical Trial
Address
Autobiography
Bibliography
Biography
Books and Documents
Case Reports
Classical Article
Clinical Conference
Clinical Study
Clinical Trial
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
Meta-Analysis
Multicenter Study
Network Meta-Analysis
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
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
Review
Scientific Integrity Review
Scoping Review
Systematic Review
Technical Report
Twin Study
Validation Study
Video-Audio Media
Webcast
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