Received: 8 October 2019
Accepted: 10 January 2020
First Online: 16 January 2020
Ethics approval and consent to participate
: The study was approved by the local Ethics committee of the University of Mannheim/Heidelberg, Germany. Written informed consent was obtained from all patients. Ethics approval number 2018-826R-MA.
: Not applicable.
: The authors declare that they have no competing interests.