This article [J. Biomed. Opt. 17, 077003 (2012)] was originally published online on 6 July 2012 with an error in Fig. 1. The erroneous figure was normalized by the peak, and the corrected figure is normalized by the area, causing the labeled peak positions to shift. The figure now matches the attributions presented in Table 2.
The corrected figure is reproduced below:
This article was corrected online on 1 March 2013.