Kim, Jeounghee http://orcid.org/0000-0001-9305-7142
Article History
Accepted: 13 November 2020
First Online: 15 December 2020
Compliance with Ethical Standards
:
: This study used publicly available existing data and no ethical approval was required.
: This study is a secondary analysis of existing data; human subjects and informed consent were not required.
: The author declares no conflict of interest.
Free to read: This content has been made available to all.