On page 2207 in the 3 April 2014 issue, there are two instances of figure duplication. In the top part of Figure 2C, the upper left image is a duplicate of the upper left image in Figure 1B (page 2205) and the upper right image is a duplicate of the lower middle image in Figure 1B. The corrected Figure 2C is shown below. The error has been corrected in the online version, which now differs from the print version.

The authors apologize for these mistakes.

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