Index History

Indexed in Pubmed® and Medline®, products of the United States National Library of Medicine.
Indexed in the Journal Citation Reports Science Edition (SCI-indexed) released by Clarivate Analytics (previously the Intellectual Property and Science business of Thomson Reuters).

Frequency:  6

Impact Factor

  • 2018: 4.252 (49/260; 15/78)
  • 2017: 3.500 (49/260; 15/78)
  • 2016: 2.937 (63/260; 22/77)
  • 2015: 2.018 (69/257; 32/76)
  • 2014: 2.482 (34/249; 27/76)
  • 2013: 3.149 (25/248; 13/76)
  • 2012: 2.743 (27/243; 15/79)

Impact Factor 5-year

  • 2018: 4.233
  • 2017: 3.661
  • 2016: 3.657
  • 2015: 2.890
  • 2014: 3.209
  • 2013: 3.371
  • 2012: 3.146

Article Influence Score

  • 2018: 1.090
  • 2017: 1.032
  • 2016: 1.099
  • 2015: 1.258
  • 2014: 1.398
  • 2013: 1.273
  • 2012: 1.291

ISSN:  1932-4545

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