Doudin, Asmma
Becker, Andreas
Rothenberger, Aribert
Meyer, Thomas http://orcid.org/0000-0003-3509-1400
Article History
Received: 30 November 2017
Revised: 9 January 2018
Accepted: 10 January 2018
First Online: 31 January 2018
Compliance with ethical standards
: The study protocol was approved by the Charité/Universitätsmedizin Berlin ethics committee and the Federal Office for the Protection of Data.
: The authors declare that they have no conflict of interest.