Received: 10 September 2018
Accepted: 23 December 2018
First Online: 8 January 2019
Ethics approval and consent to participate
: The study protocol and the written patient’s information were approved by the ethics committee of the Jena University Hospital (number 5285-10/17) and University Hospital Tübingen (number 204/2016BO1).
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.