Kraus, Tobias M.
Abele, Charlotte
Freude, Thomas
Ateschrang, Atesch
Stöckle, Ulrich
Stuby, Fabian M.
Schröter, Steffen
Article History
Received: 23 October 2017
Accepted: 27 July 2018
First Online: 7 August 2018
Ethics approval and consent to participate
: The ethics committee of the university of Tübingen, Germany approved the study protocol in June 2013 in a written manner (project number 230/2013BO2).All subjects provided consent to participate in the study.
: Not applicable.
: The authors declare that they have competing interests.
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