Funding for this research was provided by:
Friedrich-Ebert-Stiftung (1759673)
Article History
Received: 10 April 2017
Accepted: 2 April 2018
First Online: 10 April 2018
Compliance with ethical standards
:
: On behalf of all authors, the corresponding author states that there is no conflict of interest. This research project was funded by a stipend of the Friedrich-Ebert-Foundation, granted to the first author.