Funding for this research was provided by:
Ministry of Education, Science and Technology (2014R1A1A2059252)
Pusan National University Yangsan Hospital (2016)
Text and Data Mining valid from 2018-04-25
Received: 4 February 2018
Revised: 15 April 2018
Accepted: 16 April 2018
First Online: 25 April 2018
Compliance with ethical standards
: The authors have nothing to disclose.
: The present study was approved by the Institutional Review Board of Yangsan Pusan National Univeristy Hospital, in accordance with the guidelines of the Helsinki Declaration.
: The written informed consent was obtained from all participants.