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上海市读者张月仙来信问:现在关于补钙的广告特别多,里面总是提到骨质疏松症这个概念,请问什么是骨质疏松症?专家:骨质疏松症是绝经后妇女和老
Shanghai readers Zhang Yuexian letter Q: Nowadays more ads on calcium supplements, which are always referred to the concept of osteoporosis, what is osteoporosis? Expert: Osteoporosis is the postmenopausal women and the old