Park, Chul Hyun http://orcid.org/0000-0002-3101-8655
Choi, Chang Hyun
Article History
Received: 28 May 2018
First Online: 11 November 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: This study was approved by the medical ethics committee of the hospital. The study was conducted in compliance with the Declaration of Helsinki.
: Informed consent was obtained from all individual participants included in the study.