This article [J. Biomed. Opt. 17, 077002 (2012)] was originally published online on 9 July 2012 with several typographical errors in the text, described below.

In the abstract, line 10, 67.3% should be 68.8%. On p. 2, the “greater than” symbols in Sec. 2.1, line 10, and Sec. 2.2, line 18 should not be there, so that these values read $20\times 20\mu \mathrm{m}$ and $\sim 800\mu \mathrm{m}$, respectively. On p. 3, column 2, line 15, 4.05% should be 4.04%, and in line 28, 67.3% should be 68.8%. In the last row of Table 1 on p. 4, the lowercase delta should be lowercase nu ($\nu$), so that the equation reads $\nu (\mathrm{C}=\mathrm{O})$. In Fig. 6 caption, 4.05% should be 4.04%. On p. 5, column 1, line 7, the “greater than” sign should not be there, so the phrase reads “$\sim 800\mu \mathrm{m}$ in epithelial tissue.”

The article was corrected online on 25 July 2012. It appears correctly in print.