This article [J. Biomed. Opt. 17, 075010 (2012)] was originally published online on 12 July 2012 with an error. In Fig. 3, a previously unnoticed error in the data analysis code used to generate the figure caused a shift in the scaling of the blood flow index (). The multiplier at the top should be , as opposed to . The corrected figure appears below.
All versions of the article were corrected on 19 July 2012. The article appears correctly in print.