Text and Data Mining valid from 2019-01-28
Received: 20 November 2018
Accepted: 21 January 2019
First Online: 28 January 2019
Ethics approval and consent to participate
: This study was approved by the local ethics committee of the Technische University of Dresden (Ethics approval from 20.10.2015, EK 408092015), and written informed consent was obtained from all participants and the study protocol conforms to the ethical guidelines of the 1975 Declaration of Helsinki.
: “Not applicable”.
: The authors declare that they have no competing interests.
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