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A GC polymorphism associated with serum 25-hydroxyvitamin D level is a risk factor for hip fracture in Japanese patients with rheumatoid arthritis: 10-year follow-up of the Institute of Rheumatology, Rheumatoid Arthritis cohort study

Shinji Yoshida, Katsunori Ikari*, Takefumi Furuya, Yoshiaki Toyama, Atsuo Taniguchi, Hisashi Yamanaka and Shigeki Momohara

Arthritis Research & Therapy 2014, 16:R75  doi:10.1186/ar4516