Burggraf, Manuel http://orcid.org/0000-0002-6191-7360
Kristin, Julia
Wegner, Alexander
Beck, Sascha
Herbstreit, Stephanie
Dudda, Marcel
Jäger, Marcus
Kauther, Max Daniel
Article History
Received: 12 June 2018
Accepted: 18 October 2018
First Online: 29 October 2018
Ethics approval and consent to participate
: The study was approved by the local ethics committee of the University Hospital Essen (study number: 11–4891-BO) and all participants gave written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.
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