Funding for this research was provided by:
Ministry of Science, ICT and Future Planning (2018R1C1B5043991)
Received: 19 December 2018
Accepted: 27 September 2019
First Online: 15 October 2019
Ethics approval and consent to participate
: This research protocol was approved by the Institutional Review Board of Severance Hospital, South Korea (IRB No. 4–2018-0770). The study design was approved by the appropriate ethics review boards. The requirement to obtain informed patient consent was waived.
: Not applicable.
: The authors declare that they have no competing interests.