- Correspondence to Hyeok Gyu Kwon, Department of Physical Medicine and Rehabilitation, College of Medicine, Yeungnam University 317-1, Daemyungdong, Namku, Daegu 705-717, Republic of Korea;
- Received January 12, 2016
- Revised February 11, 2016
- Accepted February 22, 2016
- First published April 4, 2016.
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