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Funding
Funding for this research was provided by:
Korea Centers for Disease Control and Prevention (11180165)
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Article History
Received: 8 July 2019
Accepted: 20 January 2020
First Online: 1 February 2020
Ethics approval and consent to participate
: Our survey instrument followed the guidelines of the Institutional Review Board of Yonsei University’s College of Medicine (Yonsei IRB No. Y-2017-0084), registered on January 3rd, 2017. The trial registry can be accessed at upon request. All procedures were performed in accordance with the ethical standards of the Declaration of Helsinki. Informed consent was obtained from all individual participants included in the survey in written form.
: All authors give consent for publication.
: The authors declare that they have no competing interests.
