Ryuh, Yonjoong
Choi, Poram
Oh, Juntack
Chen, Chih-Chia
Lee, Yongho
Article History
First Online: 4 April 2019
Compliance with Ethical Standards
:
: All procedures performed in this study were in accordance with ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: The study was approved by Institutional Review Board in our university. All parents/legal guardians signed an informed consent form, and children assented.
: No conflict of interest has been declared.