Schievelkamp, Arndt-Hendrik
Jurcoane, Alina
Rüber, Theodor
Ernst, Leon
Müller, Andreas
Mädler, Burkhard
Schild, Hans Heinz
Hattingen, Elke
Article History
Received: 14 February 2018
Accepted: 25 June 2018
First Online: 16 July 2018
Conflict of interest
: A.-H. Schievelkamp, A. Jurcoane, T. Rüber, L. Ernst, A. Müller, B. Mädler, H.H. Schild, E. Hattingen and declare that they have no competing interests.