Received: 29 April 2020
Accepted: 4 November 2020
First Online: 27 November 2020
Ethics approval and consent to participate
: This retrospective study was approved by the ethical review committee, Pusan National University Yangsan Hospital (05–2020-007). Written informed consent was obtained from participants for research studies and presented data.
: Not applicable
: The authors declare that they have no competing interests.