Funding for this research was provided by:
Ministry of Science, ICT and Future Planning (NRF-2019M3C7A1030625)
Ministry of Health & Welfare, Republic of Korea (HI17C0870)
Text and Data Mining valid from 2020-04-03
Received: 2 May 2019
Accepted: 10 March 2020
First Online: 3 April 2020
Ethics approval and consent to participate
: Written informed consent was obtained from all individuals. Both the individuals and parents/guardians informed consent was obtained for those under the age of 18. The study protocol was approved by the Institutional Review Board of Seoul National University Hospital (IRB No. 1704–075-846) and was conducted in accordance with the Declaration of Helsinki.
: Not applicable.
: The authors declare that they have no competing interests.