Funding for this research was provided by:
Korean Health Technology R&D Project, Ministry of Health and Welfare (HI18C2386)
Article History
Received: 12 June 2019
Accepted: 25 June 2020
First Online: 3 July 2020
Ethics approval and consent to participate
: Not Applicable. To give you more description, we have not used any of patients’ data. The data described in the Methods section are metadata, which is data about data including data ‘specifications’ and ‘definitions.’ We have had no chance of using patients’ private and/or personal information at all in writing the manuscript.
: Not Applicable.
: None of the authors has conflicts of interest with other persons or organizations that could inappropriately influence their work.