Funding for this research was provided by:
National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning (2017R1C1B5017902, NRF-2017M3A9F3047497)
Received: 23 July 2019
Accepted: 16 January 2020
First Online: 24 January 2020
Ethics approval and consent to participate
: This study complied with the Declaration of Helsinki and was approved by the Institutional Review Board of Ewha Womans University Mokdong Hospital (2017-07-031). Written informed consent was obtained from all participants.
: The consent for publication is not applicable because this study does not include any individual details, images, or videos.
: Drs. Huisong Lee, Hyeon Kook Lee, Seog Ki Min, and Won Hee Lee have no competing interests.