GLP1R and diabetes mellitus: To evaluate generalizability of the Liraglutide Effect and Action in Diabetes: Evaluation of Cardiovascular Outcome Results (LEADER) randomized clinical trial (RCT) – a cardiovascular outcomes study of the glucagon-like peptide-1 receptor agonist (GLP-1RA) liraglutide – to US Veterans Affairs Healthcare System (VA) patients with diabetes, a population at high cardiovascular disease risk lacking direct RCT evidence of GLP-1RA efficacy.