This article was originally published in Vol. 17, No. 7 of the Journal of Biomedical Optics on 17 July 2012 with an incorrect citation identifier (CID) of 078003. The paper was removed and republished online with a correct CID of 077012 on 30 July 2012.

The typical structure of the six-digit CID for JBO uses the first two digits to indicate the volume number, and the middle two digits to indicate the section category. This paper was originally published under the heading “Therapeutic” (section code 80), but has been republished under the category “Sensing,” which uses section code 70.

For more information on the use of CIDs in JBO, see http://spiedigitallibrary.org/jbo/citation_format.