Received: 27 October 2020
Accepted: 29 March 2021
First Online: 7 April 2021
: The study was approved by the Medical Ethical Committee of the Chia-Yi Christian Hospital (IRB2020131). As this was a retrospective study, the Medical Ethical Committee of the hospital had approved that the requirement for the informed consent was waived.
: Not applicable.
: All authors declare no competing interests.