Funding for this research was provided by:
von Bodelschwinghsche Stiftungen Bethel (n.a.)
Received: 19 November 2018
Accepted: 10 January 2019
First Online: 22 January 2019
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: All participants gave informed consent before taking part in the study, which was approved by the ethics board of Bielefeld University (ethics statement 2016–133).
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