The authors regret that the project number stated in the funding acknowledgement of the original article was incorrect. The correct funding statement should read: “The investigations were funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) - project number 374073886 (Gefördert durch die Deutsche Forschungsgemeinschaft (DFG) - Projektnummer 374073886).” The authors would like to apologise for any inconvenience caused.
Bergmann et al. (Thu,) studied this question.