Received: 22 September 2020
Accepted: 10 December 2020
First Online: 19 January 2021
Compliance with Ethical Standards
: The authors have no conflict of interest to declare.
: This study was approved by the local ethical committee [837.516.16 (10834)] and a retrospective cohort study was designed following the ethical standards laid down in the World Medical Association Declaration of Helsinki (June 1964) and its later amendments.
: Informed consent was obtained from all study participants.