Raulf, Monika
Joest, Marcus
Sander, Ingrid
Hoffmeyer, Frank
Nowak, Dennis
Ochmann, Uta
Preisser, Alexandra
Schreiber, Jens
Sennekamp, Joachim
Koschel, Dirk
Article History
Received: 11 January 2019
Accepted: 17 April 2019
First Online: 13 September 2019
Ethical approval
: The study design and the protocol were reviewed and approved by the ethical committee of the Technische Universität Dresden (EK 195052014) in accordance with the Declaration of Helsinki and ethical approval was obtained from the local ethic committee of each centre.