aDepartment of Physical Therapy, College of Health and Therapy, Daegu Haany University, Daegu, Korea
bDepartment of Physical Therapy, College of Health Science, Cheongju University, Cheongju, Korea
cDepartment of Physical Therapy, Gangneung Yeongdong College, Gangneung, Korea
Copyright © 2016 Korea Centers for Disease Control and Prevention. Published by Elsevier Korea LLC.
This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).