Funding for this research was provided by:
Ministry of Science and ICT (2017-0-00053)
Ministry of Health and Welfare (HR20C0026)
Received: 21 September 2020
Accepted: 10 January 2021
First Online: 28 January 2021
Ethics approval and consent to participate
: The collection of data and data preparation received Asan Medical Center and Ulsan University Hospital institutional review board approval with waived informed consent (AMCCV 2016-26 ver2.1).
: Not applicable.