Received: 1 November 2020
Accepted: 25 December 2020
First Online: 9 January 2021
Ethics approval and consent to participate
: The informed consent of patients was not required because the related data were anonymized before the analyses. All methods were conducted in accordance with the approved guidelines.
: Not applicable.
: This material has not been published and is not under consideration elsewhere. The authors declare that they have no competing interests.