Petroff, D
Kromeyer-Hauschild, K
Wiegand, S
l'Allemand-Jander, D
Binder, G
Schwab, K-O
Stachow, R
Kiess, W
Hammer, E
Sturm, S
Holl, R W
Blüher, S
Article History
Received: 15 July 2014
Revised: 27 August 2014
Accepted: 8 September 2014
First Online: 12 September 2014
Competing interests
: The authors declare no conflict of interest.