Urich, Eduard
Schmucki, Roland
Ruderisch, Nadine
Kitas, Eric
Certa, Ulrich
Jacobsen, Helmut
Schweitzer, Christophe
Bergadano, Alessandra
Ebeling, Martin
Loetscher, Hansruedi
Freskgård, Per-Ola
Article History
Received: 8 April 2015
Accepted: 18 August 2015
First Online: 28 September 2015
Competing interests
: The authors declare no competing financial interests.