Semmelmann, Florian
Hofferberth, John
Ruther, Joachim http://orcid.org/0000-0002-1295-347X
Sterner, Reinhard
Funding for this research was provided by:
Konrad-Adenauer-Stiftung (n.a.)
Deutsche Forschungsgemeinschaft (RU 717/10-2)
Article History
Received: 13 July 2018
Accepted: 5 December 2018
First Online: 23 January 2019
Competing Interests
: The authors declare no competing interests.