Cho, Youn-Mo
Kim, Hyoung-Ryoul
Kang, Mo-Yeol
Myong, Jun-Pyo
Koo, Jung Wan
Article History
Received: 19 October 2018
Accepted: 29 July 2019
First Online: 5 August 2019
Ethics approval and consent to participate
: The data collection was performed after approval of Korea Centers for Disease Control and Prevention IRB.
: Not applicable.
: The authors declare that they have no competing interests.