Article History
Received: 8 May 2020
Accepted: 16 August 2020
First Online: 30 September 2020
Compliance with Ethical Standards
:
: The authors declare that they have no conflict of interest.
: This study was exempted from ethical approval due to its retrospective design, but was performed in accordance with the ethical standards as laid down in the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards.
: For this type of study, informed consent is not required.