Funding for this research was provided by:
National Research Foundation of Korea (2013R1A6A3A04059017, 2016R1D1A1B03933410, 2018R1A2B6004608)
National Cancer Center (NCC-1810220-01)
Article History
Received: 5 April 2017
Accepted: 15 August 2018
First Online: 22 August 2018
Ethics approval and consent to participate
: The Institutional Review Board of Gangnam CHA hospital (IRB No. GCI-16-22) granted ethics approval and waived informed consent.
: 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.