Schmuch, Richard http://orcid.org/0000-0002-5670-0327
Wagner, Ralf http://orcid.org/0000-0002-5801-9260
Hörpel, Gerhard http://orcid.org/0000-0002-1976-5500
Placke, Tobias http://orcid.org/0000-0002-2097-5193
Winter, Martin http://orcid.org/0000-0003-4176-5811
Article History
Received: 27 October 2017
Accepted: 29 January 2018
First Online: 12 April 2018
Competing interests
: The authors declare no competing interests.