Mitterer, Valentin
Gantenbein, Nadine
Birner-Gruenberger, Ruth
Murat, Guillaume
Bergler, Helmut
Kressler, Dieter
Pertschy, Brigitte
Article History
Received: 12 August 2016
Accepted: 19 October 2016
First Online: 7 November 2016
Competing interests
: The authors declare no competing financial interests.