- Received December 3, 2014, and in revised form February 25, 2015.
- Accepted for publication March 24, 2015.
- Reprints: Xi-guo Cai, PhD, Department of Rehabilitation Medicine, Henan Provincial People’s Hospital, Zhengzhou 450003, Henan Province, China. E-mail: .
- X.L. and Y.L. are contributed equally to this work.
- First published December 15, 2015.
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