Funding for this research was provided by:
Ministry of Education (NRF-2017R1D1A1B03035556)
Ministry of Science and ICT (NRF-2019M2D2A1A01058210)
Korea National Institute of Health (HI18C0886, HI19C0339)
Received: 24 July 2019
Accepted: 24 September 2019
First Online: 21 November 2019
Ethics approval and consent to participate
: 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. Informed consent was obtained from all individual participants included in the study.
: Consent has been obtained from participants to publish this work.
: The authors declare that they have no competing interests.