Deffner, Veronika
Küchenhoff, Helmut
Maier, Verena
Pitz, Mike
Cyrys, Josef
Breitner, Susanne
Schneider, Alexandra
Gu, Jianwei
Geruschkat, Uta
Peters, Annette
Article History
Received: 24 April 2014
Revised: 23 July 2014
Accepted: 28 August 2014
First Online: 19 November 2014
Competing interests
: The authors declare no conflict of interest.