Ning Li, Yi-Bo Zheng, Jie Han*, Wei Liang, Jia-Yi Wang, Jie-Ru Zhou, Yi Shen and Jie Zhang
* Corresponding author: Jie Han jiehancn@126.com
BMC Musculoskeletal Disorders 2013, 14:49 doi:10.1186/1471-2474-14-49
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