Received: 12 December 2020
Accepted: 31 March 2021
First Online: 28 May 2021
: In phase 1 (phantom study), the need for approval was waived. In phase 2 (retrospective study), the need for approval was waived due to regional patient informed consent in outpatient clinics including a clause on data anonymisation and availability for medical research.
: Not applicable
: The authors declare that they have no competing interests.