Department of Nursing, Kangwon National University, Chuncheon, Korea.
© 2015 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 study was supported by a 2011 Research Grant from Kangwon National University (No. C1007963-01-01).