Text and Data Mining valid from 2019-01-31
Received: 26 October 2018
Accepted: 21 January 2019
First Online: 31 January 2019
Compliance with ethical standards
: Patients were recruited and enrolled in the study after written informed consent. The study was approved by the ethics committee of the Medical Faculty of the University of Würzburg (reference number 287/14) and the Freiburg Ethics Committee International (FEKI) and registered by ISRCTN (ISRCTN14518136).
: The authors declare that they have no conflict of interest.