Sobol, O.
Straub, F.
Wirth, Th.
Holzlechner, G.
Boellinghaus, Th.
Unger, W. E. S.
Article History
Received: 14 September 2015
Accepted: 21 December 2015
First Online: 2 February 2016
Competing interests
: The authors declare no competing financial interests.