Date Published: June 6, 2014
Publisher: Public Library of Science
Figure 1 in the original article contains two duplicate panels that were inserted during a manuscript revision. Two of the six images in Figure 1C were inadvertently deleted and replaced with duplicates of the adjacent photographic panels. The six correct Figure 1C photographic panels were used during peer review, and are now restored in the corrected version of Figure 1. Please see the correct Figure 1 here.