Zürch, M.
Rothhardt, J.
Hädrich, S.
Demmler, S.
Krebs, M.
Limpert, J.
Tünnermann, A.
Guggenmos, A.
Kleineberg, U.
Spielmann, C.
Article History
Received: 15 September 2014
Accepted: 18 November 2014
First Online: 8 December 2014
Competing interests
: The authors declare no competing financial interests.