Funding for this research was provided by:
Korea National Institute of Health (4800-4845-302 (2017-NI63001-00))
Article History
Received: 18 July 2017
Accepted: 16 May 2018
First Online: 30 May 2018
Ethics approval and consent to participate
: The Institutional Review Board of the Korean Centers for Disease Control and Prevention approved the KoGES protocol. Written informed consent was obtained from all subjects.
: The authors declare that they have no competing interest.
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