Article History
Received: 12 September 2020
Accepted: 2 December 2020
First Online: 16 January 2021
Compliance with ethical standards
:
: On behalf of all authors, the corresponding author states that there is no conflict of interest.
: As this was a retrospective analysis of the studies that had been published in the past, no consent to participate was necessary.
: Authors of this study grant the publisher sole and exclusive license of the full copyright.