Text and Data Mining valid from 2019-12-31
Received: 27 July 2019
Accepted: 11 December 2019
First Online: 31 December 2019
Ethics approval and consent to participate
: This study was approved by the ethics review committees of the Friedrich-Alexander-Universität Erlangen-Nürnberg (No. 2725). All patients gave their written informed consent.
: Not applicable.
: The authors have declared that no competing interests exist.