Funding for this research was provided by:
Ministry of Science, ICT and Future Planning (NRF-2012M3A9C4048762, NRF-2016R1A2B4011662)
Article History
Received: 9 July 2017
Accepted: 3 October 2018
First Online: 15 October 2018
Ethics approval and consent to participate
: We gave all subjects a careful explanation of the purpose of the study and received written consent prior to their participation. The protocol used in the study was approved by the the Institutional Review Boards of Yonsei University and the Yonsei University Severance Hospital approved the study protocol, which complied with the Declaration of Helsinki.
: Not applicable
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.