Kim, Gwang Sil
Oh, Hyun Ho
Kim, Sang Hyun
Kim, Byung Ok
Byun, Young Sup http://orcid.org/0000-0002-6360-6400
Article History
Received: 14 October 2018
Accepted: 21 March 2019
First Online: 16 April 2019
Ethics approval and consent to participate
: The study protocol was approved by the ethics committee of the Korean Centre for Disease Control. Informed consent was obtained from all study participants in written format.
: Not applicable
: The authors declare that they have no competing interests.
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