Received: 28 February 2020
Accepted: 20 July 2020
First Online: 6 August 2020
Ethics approval and consent to participate
: We complied with all relevant ethical regulations for work with human participants. Informed consent was obtained. This study was approved by the institutional review board at Samsung Medical Center (2018-03-130 and 2013-10-112).
: All authors give consent for the publication of the manuscript.
: The authors declare no competing financial interests.