Kim, Taeryoon
Nam, Ga Eun
Han, Byoungduck
Cho, Sung Jung
Kim, Junghun
Eum, Do Hyun
Lee, Sang Woo
Min, Soon Hong
Lee, Woohyun
Han, Kyungdo
Park, Yong Gyu
Article History
Received: 27 December 2017
Accepted: 6 June 2018
First Online: 16 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 national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Written informed consent was obtained from all participants prior to conducting the survey. The institutional review board of KCDC approved the survey protocol (2010-02con-21-C, 2011-02con-06-C, 2012-01EXP-01-2C).