Received: 23 March 2020
Accepted: 15 February 2021
First Online: 11 March 2021
Ethics approval and consent to participate
: Upon admission to the Schoen Clinic Roseneck, all patients were asked to sign informed consent that their routine data may be used for scientific studies and publications. All procedures were in accordance with the ethical standards of the institutional review board of the LMU Munich and with the 1964 Helsinki declaration and its later amendments. According to the guidelines by the institutional review board of the LMU Munich, retrospective studies conducted on already available, anonymized data are exempt from requiring ethics approval.
: Not applicable.
: The authors declare that there are no competing interests.