Received: 3 November 2018
Accepted: 3 January 2019
First Online: 15 January 2019
Ethics approval and consent to participate
: Please note that an ethical statement for the DEAS study was not necessary because criteria for the need of an ethical statement was not met (risk for the respondents, lack of information about the aims of the study, examination of patients). Prior to the interview, written informed consent was given.
: Not applicable.
: The authors declare that they have no competing interests.
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