Napierala, H.
Hillebrandt, K.-H.
Haep, N.
Tang, P.
Tintemann, M.
Gassner, J.
Noesser, M.
Everwien, H.
Seiffert, N.
Kluge, M.
Teegen, E.
Polenz, D.
Lippert, S.
Geisel, D.
Reutzel Selke, A.
Raschzok, N.
Andreou, A.
Pratschke, J.
Sauer, I. M.
Struecker, B.
Article History
Received: 23 May 2016
Accepted: 29 December 2016
First Online: 2 February 2017
Competing interests
: The authors declare no competing financial interests.