Received: 15 October 2018
Accepted: 30 March 2020
First Online: 10 April 2020
Ethics approval and consent to participate
: Ethical approval for the study was obtained from the ethics committee of the Martin Luther University Halle-Wittenberg, Halle (Saale), Germany (approval reference: 2013–25).Both written and verbal consent was obtained from all patients prior to inclusion in the study.
: Not applicable.
: The authors declare that they have no competing interests.