Scimago Journal & Country Rank

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Country United States  - SIR icon SIR Ranking of United States
H Index
Subject Area and CategoryMedicine
PublisherImpact Journals
Publication typeJournals
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The set of journals have been ranked according to their SJR and divided into four equal groups, four quartiles. Q1 (green) comprises the quarter of the journals with the highest values, Q2 (yellow) the second highest values, Q3 (orange) the third highest values and Q4 (red) the lowest values.


The SJR is a size-independent prestige indicator that ranks journals by their 'average prestige per article'. It is based on the idea that 'all citations are not created equal'. SJR is a measure of scientific influence of journals that accounts for both the number of citations received by a journal and the importance or prestige of the journals where such citations come from It measures the scientific influence of the average article in a journal, it expresses how central to the global scientific discussion an average article of the journal is.

Citations per document

This indicator counts the number of citations received by documents from a journal and divides them by the total number of documents published in that journal. The chart shows the evolution of the average number of times documents published in a journal in the past two, three and four years have been cited in the current year. The two years line is equivalent to journal impact factor ™ (Thomson Reuters) metric.

Cites per documentYearValue
Cites / Doc. (4 years)20100.000
Cites / Doc. (4 years)20115.107
Cites / Doc. (4 years)20128.005
Cites / Doc. (4 years)20137.096
Cites / Doc. (4 years)20146.993
Cites / Doc. (4 years)20155.795
Cites / Doc. (4 years)20165.461
Cites / Doc. (4 years)20174.953
Cites / Doc. (4 years)20184.089
Cites / Doc. (3 years)20100.000
Cites / Doc. (3 years)20115.107
Cites / Doc. (3 years)20128.005
Cites / Doc. (3 years)20137.096
Cites / Doc. (3 years)20147.060
Cites / Doc. (3 years)20155.755
Cites / Doc. (3 years)20165.378
Cites / Doc. (3 years)20174.936
Cites / Doc. (3 years)20184.017
Cites / Doc. (2 years)20100.000
Cites / Doc. (2 years)20115.107
Cites / Doc. (2 years)20128.005
Cites / Doc. (2 years)20137.208
Cites / Doc. (2 years)20146.997
Cites / Doc. (2 years)20155.337
Cites / Doc. (2 years)20165.321
Cites / Doc. (2 years)20174.794
Cites / Doc. (2 years)20183.707
Total Cites 

Evolution of the total number of citations and journal's self-citations received by a journal's published documents during the three previous years.
Journal Self-citation is defined as the number of citation from a journal citing article to articles published by the same journal.

Self Cites20100
Self Cites201170
Self Cites2012359
Self Cites2013251
Self Cites2014628
Self Cites20151637
Self Cites20164788
Self Cites20178713
Self Cites20182933
Total Cites20100
Total Cites2011383
Total Cites20121633
Total Cites20132377
Total Cites20143311
Total Cites20157648
Total Cites201623751
Total Cites201753436
Total Cites201873930
External Cites per Doc 
Cites per Doc

Evolution of the number of total citation per document and external citation per document (i.e. journal self-citations removed) received by a journal's published documents during the three previous years. External citations are calculated by subtracting the number of self-citations from the total number of citations received by the journal’s documents.

External Cites per document20100
External Cites per document20114.173
External Cites per document20126.245
External Cites per document20136.346
External Cites per document20145.721
External Cites per document20154.523
External Cites per document20164.294
External Cites per document20174.131
External Cites per document20183.857
Cites per document20100.000
Cites per document20115.107
Cites per document20128.005
Cites per document20137.096
Cites per document20147.060
Cites per document20155.755
Cites per document20165.378
Cites per document20174.936
Cites per document20184.017
% International Collaboration

International Collaboration accounts for the articles that have been produced by researchers from several countries. The chart shows the ratio of a journal's documents signed by researchers from more than one country; that is including more than one country address.

YearInternational Collaboration
Citable documents 
Non-citable documents

Not every article in a journal is considered primary research and therefore "citable", this chart shows the ratio of a journal's articles including substantial research (research articles, conference papers and reviews) in three year windows vs. those documents other than research articles, reviews and conference papers.

Non-citable documents20100
Non-citable documents201115
Non-citable documents201241
Non-citable documents201397
Non-citable documents2014128
Non-citable documents2015143
Non-citable documents2016403
Non-citable documents2017454
Non-citable documents2018822
Citable documents20100
Citable documents201175
Citable documents2012204
Citable documents2013335
Citable documents2014469
Citable documents20151329
Citable documents20164416
Citable documents201710825
Citable documents201818406
Cited documents 
Uncited documents

Ratio of a journal's items, grouped in three years windows, that have been cited at least once vs. those not cited during the following year.

Uncited documents20100
Uncited documents20119
Uncited documents201231
Uncited documents201360
Uncited documents201466
Uncited documents2015141
Uncited documents2016551
Uncited documents20171193
Uncited documents20183010
Cited documents20100
Cited documents201181
Cited documents2012214
Cited documents2013372
Cited documents2014531
Cited documents20151331
Cited documents20164268
Cited documents201710086
Cited documents201816218
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