GLP1R and type 2 diabetes mellitus: The online databases, including MEDLINE/Pubmed/PubMed Central® (PMC), Google Scholar, ScienceDirect, EBSCO, Scopus, Web of Science, Embase, and reference lists, were thoroughly searched using specific keywords such as GLP-1 receptor agonists (e.g., exenatide, lixisenatide, liraglutide, dulaglutide, albiglutide, semaglutide, tirzepatide), T2DM, as well as terms related to cardioprotection, renoprotection, and neuroprotection.