Text and Data Mining valid from 2018-11-05
Received: 18 July 2018
Revised: 4 October 2018
Accepted: 19 October 2018
First Online: 5 November 2018
Compliance with ethical standards
: All authors claim that all procedures contributing to this work comply with the ethical standards of the relevant national and institutional committees on human experimentation and with the Helsinki Declaration of 1975, as revised in 2008. The Institutional Review Board of Tri-Service General Hospital approved this study (TSGHIRB No.2-105-05-082).
: The authors declare that they have no conflict of interest.