Funding for this research was provided by:
National Research Foundation of Korea (NRF-2017R1D1A1B03034165)
Text and Data Mining valid from 2019-04-15
Received: 12 December 2018
Accepted: 2 March 2019
First Online: 15 April 2019
Compliance with ethical standards
: The authors declare no conflict of interest.
: This study was approved by the Institutional Review Board of Seoul St. Mary’s Hospital (KC14TIMI0933) and Samsung Medical Center (201510120001). All procedures were in accordance with the ethical standards of the institutional and national research committee and with the 1964 Helsinki Declaration.
: The requirement for written informed consent was waived according to the decision of IRB.