Funding for this research was provided by:
Korea Centers for Disease Control and Prevention (2017-NI52002-00 and 4838-303-210-13)
Received: 25 July 2019
Accepted: 1 June 2020
First Online: 17 June 2020
Ethics approval and consent to participate
: This study was approved by the Institutional Animal Care and Use Committee (IACUC, KCDC-045-16-2A). Two participants gave their written consent to participate.
: Written informed consent was obtained from two participants for their data to be used for research and publication.
: The authors declare that they have no competing interests.