Leikam, C
Hufnagel, A L
Otto, C
Murphy, D J
Mühling, B
Kneitz, S
Nanda, I
Schmid, M
Wagner, T U
Haferkamp, S
Bröcker, E-B
Schartl, M
Meierjohann, S
Article History
Received: 14 July 2014
Revised: 10 February 2015
Accepted: 11 February 2015
First Online: 2 April 2015
Competing interests
: The authors declare no conflict of interest.