Heiss, Kirsten
Maier, Marion Irmgard
Hoffmann, Angelika
Frank, Roland
Bendszus, Martin
Mueller, Ann-Kristin
Pfeil, Johannes
Article History
Received: 4 April 2017
Accepted: 5 February 2018
First Online: 15 February 2018
Competing Interests
: The authors declare no competing interests.