Funding for this research was provided by:
Universitätsklinikum Hamburg-Eppendorf (UKE)
Received: 21 December 2020
Accepted: 26 July 2021
First Online: 24 August 2021
: The study was not submitted to an ethic commission as only anonym routine data of an insurance were used and no personal data were collected and no medical test was performed in the scope of the study. In accordance with the Professional Code for Physicians in Hamburg (Art. 15, 1) and the Chamber Legislation for Medical Professions in the Federal State of Hamburg (HmbKGH) it is only necessary to obtain advice on questions of professional ethics and professional conduct from an Ethics Committee if data which can be traced to a particular individual is being used in a research project. However, the study was approved by the data protection board of the insurance which provided the data.
: Not applicable.
: The authors declare that they have no competing interests.