Text and Data Mining valid from 2019-05-29
Received: 12 March 2019
Accepted: 14 May 2019
First Online: 29 May 2019
Compliance with ethical standards
: The study protocol was approved by the Institutional Review Board of Konkuk University Medical Center.
: The authors declare that they have no conflicts of interest.
: Informed consent was obtained from all individual participants included in the study.