Funding for this research was provided by:
Korean Health Technology R&D Project, Ministry of Health & Welfare, Republic of Korea (HI14C3418)
Received: 29 April 2019
Accepted: 8 August 2019
First Online: 14 August 2019
Ethics approval and consent to participate
: This study was approved by the Institutional Review Board of Samsung Medical Center (IRB No. 2018–07-080), and informed consent was waived.
: Not applicable.
: The authors declare that they have no competing interests.