Funding for this research was provided by:
Paracelsus Medizinische Privatuniversität (D-17/02/007-PIL)
Received: 17 February 2021
Accepted: 23 April 2021
First Online: 1 May 2021
: This retrospective study was conducted according to the principles of the Declaration of Helsinki and all subsequent revisions and was approved by the routing Ethics Committee of the province Salzburg (EC number: 415-E/2491/2-2019).
: Not applicable.
: The authors declare that they have no competing interests.