根据美国国立糖尿病、消化和肾脏疾病研究所，卫生研究所报告：当胆固醇变硬然后堵塞胆管，于是就会出现了胆结石。
They occur when cholesterol hardens and this then blocks bile ducts, according to the National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health.
进入由美国国立卫生研究院开发的糖尿病字典。
Access the diabetes dictionary developed by the US National Institutes of Health.
进入由美国国立卫生研究院开发的糖尿病字典。
Access the diabetes dictionary developed by the US National Institutes of Health.
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