Funding for this research was provided by:
Deutsche Forschungsgemeinschaft (KR3691/5-1)
Article History
First Online: 9 May 2018
Compliance with ethical standards
:
: All procedures performed in this study were in accordance with the ethical standards of the institutional research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. The study had been approved by the ethics committee of the University of Lübeck.
: The authors declare no conflict of interest.
: All participants provided written informed consent. Additional informed consent was obtained from the confederate, for whom identifying information is included in this article.