The authors of the above research article have informed the journal that an assembly error occurred in Figure 4 during the final revision stage when requested to merge separate figures: Figure 4D appears as a replication of Figure 4B due to an accidental insertion. The new Figure 4D replaces panel D of the original figure with the correct one used throughout the review process. The authors apologize for this typographical oversight and for any inconvenience caused.
- © 2015 The Authors. Published under the terms of the CC BY 4.0 license