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二级参考文献5
1Pan CY, Lu JM, Tian H, et al. Study of the prevalence of diabetes mellitus in adults in the Shougang Corporation in Beijing.Diabet Med, 1996, 13:663-668.
2The Diabetes Prevention Program Research Group. The Diabetes Prevention Program. Diabetes Care, 1999, 22 : 623-634.
3Li CL, Pan CY, Lu JM, et al. Effect of metformin on patients with impaired glucose tolerance. Diabet Med, 1999, 16: 477-481.
