Lenders, Michael H. H.
Weidtkamp-Peters, Stefanie
Kleinschrodt, Diana
Jaeger, Karl-Erich
Smits, Sander H. J.
Schmitt, Lutz
Article History
Received: 25 March 2015
Accepted: 25 June 2015
First Online: 27 July 2015
Competing interests
: The authors declare no competing financial interests.