Funding for this research was provided by:
Korea Centers for Disease Control & Prevention (2015-I134)
Text and Data Mining valid from 2019-09-21
First Online: 21 September 2019
Compliance with Ethical Standards
: The authors declare that they have no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Ethics approval was obtained from the Hallym University Sacred Heart Hospital’s Institutional Review Board (approval number: 2015-I134 and 2016-I135).
: Informed consent was obtained from all individual participants included in the study.