Lee, Jang-Wook http://orcid.org/0000-0003-2181-5850
Lee, Kwang-Hoon http://orcid.org/0000-0002-9506-9072
Article History
Received: 26 September 2018
Accepted: 7 December 2018
First Online: 2 January 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. For this type of study formal consent is not required.