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Follistatin-like protein 1: a serum biochemical marker reflecting the severity of joint damage in patients with osteoarthritis

Yuji Wang*, Dawei Li*, Nanwei Xu, Weijian Tao, Ruixia Zhu, Rongbin Sun, Weiwei Fan, Ping Zhang, Tianhua Dong and Long Yu

Arthritis Research & Therapy 2011, 13:R193  doi:10.1186/ar3522