Mean effect ± standard deviation (SD) of mesenchymal stem cells (Treatment) or placebo/no treatment (Control) on the improvement of LVEF (%) based on the route of delivery: intramyocardial injection (DI), transendocardial stem cell injection (TESI), intracoronary infusion (IC), and intravenous infusion (IV), in acute myocardial infarction (AMI) swine studies illustrating that TESI, DI, and IV favors MSC treatment while IC does not. Number of animals in each arm of the study (Total). Relative weight of each study (Weight). Mean difference between Treatment and Control with a 95% confidence interval (95% CI), using inverse variance (IV) and random effects model (Random).