Kratzenberg, Jeannette
Salomon, Georg
Tennstedt, Pierre
Dell’Oglio, Paolo
Tilki, Derya
Haferkamp, Axel
Graefen, Markus
Boehm, Katharina
Article History
Received: 27 July 2017
Accepted: 5 January 2018
First Online: 13 January 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: The study was approved by the local ethics board, and all subjects provided written informed consent.