This article [J. Biomed. Opt. 14, 030501 (May/June 2009)] was originally published online on 11 May 2009 with an error in the spelling of an author name. The name Gibbs-Struass was corrected to Gibbs-Strauss. All online versions of the article were corrected on 20 May 2009 and the article appears correctly in print.
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