Prevalence of and Risk Factors for Community-Based Osteoporosis and Associated Fractures in Beijing: Study Protocol for a Cross-Sectional and Prospective Study by Menghua Sun, Yili Zhang, Hao Shen, Kai Sun, Baoyu Qi, Chenchen Yu, Yingjie Zhi, Ranxing Zhang, Junjie Jiang, Yan Chai, Xu Wei, Yanming Xie

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