Pupeza, I.
Sánchez, D.
Zhang, J.
Lilienfein, N.
Seidel, M.
Karpowicz, N.
Paasch-Colberg, T.
Znakovskaya, I.
Pescher, M.
Schweinberger, W.
Pervak, V.
Fill, E.
Pronin, O.
Wei, Z.
Krausz, F.
Apolonski, A.
Biegert, J.
Article History
Received: 29 December 2014
Accepted: 19 August 2015
First Online: 21 September 2015
Competing interests
: The authors declare no competing financial interests.