Frigge, T.
Hafke, B.
Witte, T.
Krenzer, B.
Streubühr, C.
Samad Syed, A.
Mikšić Trontl, V.
Avigo, I.
Zhou, P.
Ligges, M.
von der Linde, D.
Bovensiepen, U.
Horn-von Hoegen, M.
Wippermann, S.
Lücke, A.
Sanna, S.
Gerstmann, U.
Schmidt, W. G.
Article History
Received: 12 August 2016
Accepted: 27 January 2017
First Online: 29 March 2017
Competing interests
: The authors declare no competing financial interests.