Effects of dipeptidyl peptidase‐4 inhibitors in a type 2 diabetes patient with failure of glucagon‐like peptide‐1 receptor agonists (二肽基肽酶‐4抑制剂在1名使用胰高血糖素样肽‐1受体激动剂治疗失败的2型糖尿病患者中的作用)