Text and Data Mining valid from 2018-11-07
Received: 27 April 2018
Accepted: 24 October 2018
First Online: 7 November 2018
Ethics approval and consent to participate
: This study was approved by the ethical review committee of the Friedrich-Alexander-University of Erlangen-Nuremberg (AZ 169_15Bc).
: The participants with identifying photographs (Figs. InternalRef removed and InternalRef removed) gave written consent for publication.
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