1Department of Nursing, Changwon National University, Changwon, Korea.
2Department of Nursing, Chungbuk National University, Cheongju, Korea.
3Department of Statistics, Inje University, Gimhae, Korea.
4College of Nursing, Eulji University, Daejeon, Korea.
© 2016 Korean Society of Nursing Science
This is an Open Access article distributed under the terms of the Creative Commons Attribution NoDerivs License. (http://creativecommons.org/licenses/by-nd/4.0/) If the original work is properly cited and retained without any modification or reproduction, it can be used and re-distributed in any format and medium.
This paper was supported by research funds of Changwon National University in 2014.
The authors declared no conflicts of interest.