Funding for this research was provided by:
Munich Centre for Health Sciences
Text and Data Mining valid from 2019-01-22
Received: 23 October 2017
Accepted: 14 January 2019
First Online: 22 January 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: The study was approved by the Ethics Committee of the Medical Faculty of the Ludwig-Maximilians-University of Munich (no. 99-15).
: Written informed consent was given by all study participants.