Funding for this research was provided by:
Bundesministerium für Ernährung und Landwirtschaft
Text and Data Mining valid from 2018-10-10
Received: 19 June 2018
Accepted: 1 October 2018
First Online: 10 October 2018
Compliance with ethical standards
: The authors have no conflict of interest and confirm that there are no disputes over the ownership of the data presented and all contributions have been attributed appropriately.