Funding for this research was provided by:
National Research Foundation of Korea (NRF-2018R1D1A1B07043445)
Received: 3 December 2018
Accepted: 6 May 2019
First Online: 14 May 2019
Ethics approval and consent to participate
: The institutional review board at Samsung Medical Center (file no. SMC201802119, February 28, 2018).
: 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.