Funding for this research was provided by:
Deutsche Forschungsgemeinschaft (FI 2057/1-1)
Article History
Received: 1 October 2018
Accepted: 17 January 2019
First Online: 24 January 2019
Ethics approval and consent to participate
: The Ethical Review Committee of the Medical Faculty of Martin Luther University, Halle-Wittenberg approved the study (No: 2015–13). All participants gave written informed consent to participate in the study prior to the interview.
: Not applicable.
: The authors declare that they have no competing interests.
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