Cha, Yoon Jin
Ahn, Sung Gwe
Bae, Soong June
Yoon, Chang Ik
Seo, Jayeong
Jung, Woo Hee
Son, Eun Ju
Jeong, Joon
Article History
Received: 22 December 2017
Accepted: 29 May 2018
First Online: 5 June 2018
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.