Funding for this research was provided by:
Catholic University of Daegu (20183015)
Article History
Received: 20 March 2019
Revised: 23 May 2019
Accepted: 30 May 2019
First Online: 24 June 2019
Compliance with ethical standards
:
: The first author (MK Choi) has received research grants from Catholic University of Daegu. The other authors (SM Kim and DJ Jo) declare that they have no conflict of interest.
: The study was approved by the institutional review board (KMC 2016-01-207).
: Informed consent was obtained from all individual participants included in the study.