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