Burghardt, Amelie
van Buuren, Frank
Dimitriadis, Zisis
GrĂ¼bbel, Tim
Seggewiss, Hubert
Scholtz, Smita
Horstkotte, Dieter
Faber, Lothar
Article History
Received: 13 July 2017
Accepted: 31 January 2018
First Online: 16 February 2018
Compliance with ethical standards
:
: The study protocol was approved by the institutional review board (Ref.-#: 14/2014) and has therefore been performed in accordance with the ethical standards laid down in the 1964 Declaration of Helsinki and its later amendments.
: The authors declare that they have no conflict of interest.