Text and Data Mining valid from 2019-01-28
Received: 11 October 2018
Accepted: 17 January 2019
First Online: 28 January 2019
Compliance with ethical standards
: All authors declare that they have no conflict of interest.
: The study was approved by the ethics committee of the University of Erlangen-Nurnberg and University of Bochum. All procedures were based on standard of care, and established clinical guidelines were followed. The study was conducted in accordance with the Declaration of Helsinki.