Funding for this research was provided by:
Ministry of Health and Welfare (HI18C1629, HI18C0335, HI19C1132)
Ministry of Science, ICT and Future Planning (NRF-2018R1A1A3A04079255)
Received: 24 February 2020
Accepted: 25 May 2020
First Online: 11 June 2020
Ethics approval and consent to participate
: The institutional review boards at all participating centers approved this study, and informed consent was obtained from the patients and caregivers.
: Not applicable.
: The authors declare that they have no competing interests.