Funding for this research was provided by:
Deutsche Forschungsgemeinschaft (SCH 1417 11-1)
Article History
Received: 11 September 2017
Accepted: 30 April 2018
First Online: 14 May 2018
Compliance with ethical standards
:
: The authors declare no conflict of interest. The founding sponsors had no role in the design of the study, analyses, or interpretation of data; in the writing of the manuscript, and in the decision to publish the results.