Received: 18 October 2019
Accepted: 3 April 2020
First Online: 20 April 2020
Ethics approval and consent to participate
: The study was approved by the ethics committee University of Duisburg-Essen (18–8042-BO). All patients signed informed consent forms prior to being enrolled.
: All patients consented to publish personal data in an anonymized form.
: The authors declare that they have no competing interests.