Funding for this research was provided by:
Received: 2 August 2021
Accepted: 25 October 2021
First Online: 19 November 2021
: Ethical approval was obtained from the ethical committee of the University of Heidelberg (application S-117/2015 of 27.04.2015) and the ethical committee of Baden-Württemberg Medical Association (application B-F-2015-054-z of 29.09.2015, Landesärztekammer Baden-Württemberg) before the start of the study. The patients were fully informed about the study, agreed to the protocol and participation was voluntary. All patients provided signed informed consent.
: Not applicable, no individual person’s data.
: The authors declare that they have no competing interests.