Comparison of fracture risk using different supplemental doses of vitamin D, calcium or their combination: a network meta-analysis of randomised controlled trials by Zhi-Chao Hu, Zhen-Hua Feng, Jiang-Wei Xuan, Wen-Fei Ni, Li Tang, Qian Tang, Chang-Min Sang, Xiaobin Li, Zhi-Hao Shen, Li-Yan Shen, Ai-Min Wu

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