This article was republished on April 10, 2015, to correct figure quality errors that were introduced during the typesetting process. The publisher apologizes for the errors. Please download this article again to view the correct version. The originally published, uncorrected article and the republished, corrected article are provided here for reference.
Authors: Rüdiger Rupp; Daniel Schließmann; Harry Plewa; Christian Schuld; Hans Jürgen Gerner; Norbert Weidner; Eberhard P Hofer; Markus Knestel Journal: PLoS One Date: 2015-03-24 Impact factor: 3.240