Funding for this research was provided by:
Bayerisches Staatsministerium für Wissenschaft, Forschung und Kunst (VIII.2-F1116.WE)
Text and Data Mining valid from 2018-12-12
Received: 14 June 2018
Revised: 26 November 2018
Accepted: 27 November 2018
First Online: 12 December 2018
Compliance with ethical standards
: The experiments comply with the current laws of Germany.
: The authors declare that they have no conflict of interest.