In the original article, the affiliations were presented incorrectly. David Petroff is in fact the only author at affiliation 2. All other authors listed as being at affiliation 2 (Tina Weiße, Sebastian Beer, Franziska Gnatzy, Joachim Mössner, Michael Tröltzsch, Johannes Wiegand and Volker Keim) are in fact just at affiliation 1. These have now been corrected in the original article.