Funding for this research was provided by:
the Korea Health Industry Development Institute (HI14C3411)
Text and Data Mining valid from 2018-04-02
Received: 23 August 2017
Accepted: 21 March 2018
First Online: 2 April 2018
: The authors declare that they have no competing interests.
: This study was approved by the Institutional Review Board of the National Cancer Center, Korea (NCCNCS-12-683). Written informed consent was obtained from all individual participants in the study.
: Not applicable.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.