Berlin, C
Kowalewski, D J
Schuster, H
Mirza, N
Walz, S
Handel, M
Schmid-Horch, B
Salih, H R
Kanz, L
Rammensee, H-G
Stevanović, S
Stickel, J S
Article History
Received: 23 April 2014
Revised: 23 July 2014
Accepted: 24 July 2014
First Online: 5 August 2014
Competing interests
: The authors declare no conflict of interest.