Fig. 1.

Individual flow diagrams of included studies. Search #1 = alogliptin OR linagliptin OR saxagliptin OR sitagliptin OR vildagliptin OR “dipeptidyl peptidase-4 inhibitors” OR “DPP-4 inhibitors” OR gliptins; Search #2 = “pooled analysis” OR “comprehensive analysis” OR “meta-analysis” OR “integrated analysis” OR “systematic review” OR “systematic assessment” OR “indirect comparison”; Search #3 = cardiovascular; Search #4 = exenatide OR liraglutide OR albiglutide OR taspoglutide OR dulaglutide OR lixisenatide OR semaglutide OR “glucagon-like peptide-1 receptor agonists” OR GLP-1; Search #5 = randomized OR randomised OR randomly; Search #6 = cardiovascular or heart [field: Title/abstract]. *Included one pairwise and network meta-analysis. CV cardiovascular, DPP-4 dipeptidyl peptidase-4, GLP-1 glucagon-like peptide-1, RCTs randomized controlled trials, T2DM type 2 diabetes mellitus