Velazquez Escobar, Francisco
Piwowarski, Patrick
Salewski, Johannes
Michael, Norbert
Fernandez Lopez, Maria
Rupp, Anna
Qureshi, Bilal Muhammad
Scheerer, Patrick
Bartl, Franz
Frankenberg-Dinkel, Nicole
Siebert, Friedrich
Andrea Mroginski, Maria
Hildebrandt, Peter
Article History
Received: 8 July 2014
Accepted: 2 March 2015
First Online: 13 April 2015
Competing interests
: The authors declare no competing financial interests.