- Correspondence to Professor Sang Seok Yeo, Department of Physical Therapy, College of Health Sciences, Dankook University, 119, Dandae-ro, Dongnam-gu, Cheonan-si, Chungnam 330-714, Republic of Korea;
- Received September 12, 2014
- Revised November 5, 2014
- Accepted December 16, 2014
- First published January 30, 2015.
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