Impact of the timing of metformin administration on glycaemic and glucagon-like peptide-1 responses to intraduodenal glucose infusion in type 2 diabetes: a double-blind, randomised, placebo-controlled, crossover study

二甲双胍给药时间对2型糖尿病患者十二指肠内葡萄糖输注后血糖和胰高血糖素样肽-1反应的影响：一项双盲、随机、安慰剂对照、交叉研究