Text and Data Mining valid from 2018-09-11
Received: 9 April 2018
Accepted: 27 August 2018
First Online: 11 September 2018
Ethics approval and consent to participate
: The study was approved by the local ethics committee (622/2015B02) at the Faculty of Medicine at the Eberhard Karls University and the Medical Center, Tübingen, Gartenstrasse 47, 72,074 Tübingen and written consent to participate was obtained from all participants.
: Not applicable.
: The authors declare that they have no competing interests.
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