血糖正常了，还要继续服用二甲双胍吗？
3. DeFronzo RA， Goodman AM. Efficacy of metformin in patients with non⁃insulin⁃dependent diabetes mellitus. The Multicenter Metformin Study Group. N Engl J Med， 1995， 333：541⁃549.
4. Ji L， Han P， Wang X， et al. A randomized clinical trial of the safety and efficacy of sitagliptin and metformin co⁃administered to Chinese patients with type 2 diabetes mellitus. J Diabetes Inves⁃tig， 2016， 7：727⁃736.
5. Esposito K， Chiodini P， Bellastella G， et al. Proportion of patients at HbA 1 c target<7% with eight classes of antidiabetic drugs in type 2 diabetes：systematic review of 218 randomized controlled trials with 78945 patients. Diabetes Obes Metab，2012， 14：228⁃233.
