Metformin administration attenuates dipeptidyl peptidase‐4 inhibitor‐induced increases in Krebs von den Lungen‐6 (KL‐6) levels: 联用二甲双胍治疗可以缓解二肽基肽酶‐4抑制剂诱导的涎液化糖链抗原‐6(KL‐6)水平升高. Issue 1 (7th October 2018)