Funding for this research was provided by:
Korea Centers for Disease Control and Prevention (#4845-303)
Received: 21 December 2019
Accepted: 12 August 2020
First Online: 26 August 2020
Ethics approval and consent to participate
: The basic protocol of this study was approved by the ethics committee of each participating centre: the institutional review boards of Seoul National University (1404–117-575), Keimyung University Dongsan Hospital (DSMC 2019–04–015-001), Chung-Ang University (1942–005-369), Severance Hospital (2019–0463-001), Boramae Medical Center (L-2019-126), and Kangwon National University Hospital (KUNH-2019-05-009). Additionally, the ethics oversight committee of the KORNERSTONE reviewed the design and protocols of this study. All of the ethical issues regarding the plans of the KORNERSTONE cohort study will be supervised by this committee. Additionally, the ethics oversight committee of the KORNERSTONE reviewed the design and protocols of this study. Written informed consent will be requested from all eligible patients. Especially, parents of all children, and children themselves if age more than 6 years, provided written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.