Funding for this research was provided by:
Medical University of Vienna
Article History
Received: 12 June 2021
Accepted: 16 August 2021
First Online: 17 September 2021
Declarations
:
: L. Yang, A. Juan and T. Waldhoer declare that they have no competing interests.
: For this article no studies with human participants or animals were performed by any of the authors. All studies performed were in accordance with the ethical standards indicated in each case. This retrospective study was performed after consultation with the institutional ethics committee and in accordance with national legal requirements. No informed consent was needed as analysis was based on anonymized data only. Ethical approval was obtained (ECS 1393/2018). Data were anonymized as well as retrospective<b>.</b>