Hur, Min
Park, Sun-Kyung
Shin, Jungho
Choi, Jung-Yoon
Yoo, Seokha
Kim, Won Ho http://orcid.org/0000-0003-1748-1296
Kim, Jin-Tae
Article History
Received: 18 February 2018
Accepted: 24 July 2018
First Online: 4 September 2018
Ethics approval and consent to participate
: The study was approved by the Seoul National University Institutional Review Boards (approval number: 1707–087-870, protocol version 2.1) and is registered at ExternalRef removed (NCT03273751). Written informed consent from parents is obtained for every study participant.
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.