Keil, Holger
Schnetzke, Marc
Kocharyan, Arpine
Vetter, Sven Yves
Beisemann, Nils
Swartman, Benedict
Grützner, Paul-Alfred
Franke, Jochen http://orcid.org/0000-0003-3755-7948
Article History
Received: 3 August 2017
Accepted: 23 January 2018
First Online: 2 February 2018
Ethics approval and consent to participate
: Ethics approval was given (Committee of the Medical Association of Rhineland-Palatinate, Mainz, Germany, reference no. 837.261.15), and participants in this study gave written consent to participate.
: Not applicable
: The authors declare that they have no competing interests.
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