Anal. Chem. 2012, 84, 10160–10164, DOI: 10.1021/ac302855m
The authors retract this article on the basis that Figure 2, which is also shown in the abstract, was determined to have been inappropriately and extensively digitally manipulated. Additionally, the original images can no longer be found in order to replace the altered images used in the article and/or to confirm the veracity of the reported conclusions. The authors apologize to the scientific community for any inconvenience that this may have caused. The original article was published on November 9, 2012 and retracted on April 18, 2018.