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This article [J. Biomed. Opt. 17, 037007 (2012)] was originally published online on 27 March 2012 with an error on p. 3. In Sec. 2.2, line 7, the line “separated by 25 cm” is a typo. It has been corrected to read “separated by 2.5 cm.” All versions of the article were corrected on 17 April 2012. |