Funding for this research was provided by:
Bundesministerium für Ernährung und Landwirtschaft (22402014)
Article History
Received: 7 February 2018
Accepted: 6 June 2018
First Online: 2 July 2018
Authors’ information
: CH is a professor and director of the “Institute for International Research on Sustainable Management and Renewable Energy” (ISR) at HfWU. VB is a former researcher at ISR. MR is a professor at HfWU and SR is a research assistant at ILU.
: Not applicable.
: Not applicable.
: The authors declare that they have no competing interests.
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