Funding for this research was provided by:
Ajou University (S2019G000100302)
Article History
Received: 9 January 2020
Accepted: 31 July 2020
First Online: 10 August 2020
Ethics approval and consent to participate
: The study was approved by the Institutional Review Board of Ajou University Hospital (AJIRB-MEDMDB-15-503) and the Korean National Health Insurance Service (REQ0000018562). The informed consent of study subjects was waved due to the characteristics of data with de-identification of personal information of claim data and analysis with online access to the Big Data Center server of the National Health Insurance Service in Korea.
: Not applicable.
: The authors declare that they have no competing interests.