Funding for this research was provided by:
Korea Health Industry Development Institute (HI18C0446)
Received: 29 April 2019
Accepted: 14 August 2019
First Online: 19 August 2019
Ethics approval and consent to participate
: This study was approved by the National Health Insurance Service of Korea (No. NHIS-2019-1-205) and the Seoul National University Hospital Institutional Review Board (IRB No. E-1810-008-975).
: Not applicable
: The authors declare that they have no competing interests.