Impact Factor
3.43
Estimated influence, citation density, publishing volume, and citation integrity from the analytics table.
Volume, recency, access pattern, and citing-community signals from the journal analytics record.
Recent article records with DOI-first linking and condensed abstracts.
Title from cover.
Online version co-published by HighWire Press.
Print issues ceased with v. 42 (Oct. 2010)
Online version began with: Vol. 1 (15 July 1999).
Also issued online.