Funding for this research was provided by:
Felix Mandl Fund
Article History
Received: 8 March 2017
Accepted: 11 February 2018
First Online: 23 February 2018
Compliance with ethical standards
: The ethics commission of the Medical University of Vienna reviewed and approved the study protocol (no. 1223/2014). Participation was strictly voluntary. Each patient was informed about the study aims and procedures orally and in writing before informed consent was obtained.
: The authors declare that they have no conflict of interest.